Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c00efa1a38db901…

MALICIOUS

PDF

95.9 KB Created: 2021-04-01 21:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a92c4f04252634e3d0c124aa5d7e3136 SHA-1: 57a6b2d5d27df47f57ccbcacea1dab540160aafa SHA-256: 0c00efa1a38db901d751dec437d29b15331b8af896ab24ba031522a04494b169
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=awei+t8+manual+pdf PDF link annotation
    • http://instacopyrighthelpteam.com/mogabes1cl97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_6033ba8159436.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/sample_iep_for_hearing_impaired_student1d6wz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_601b38a24274b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_601f76b4d15d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_6017c6ca00e14.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/ghfic2K/wheelie_bike_game_record.pdfIn PDF document text
    • https://cdn.sqhk.co/gawivoxolo/3Oighh7/sports_car_sound_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/dhcZigg/bipedapur.pdfIn PDF document text
    • http://ompala.store/cva_wolf_stainless_steel_barrel8b7nb.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/gfJWCaj/84071646966.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc7392bc020a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_edae3705ff87495084d40fb609e2ef6f.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_46a4a2a8486847e29eea052f89e4a0d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/sentencing_guidelines_robbery_2018.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_d31f0e1cc46a435db594edaa1b85d565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/a_series_of_unfortunate_events_characters_quiz.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_97b25e308bb547cfa1b48fe27bf4412e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/wuwodonukuleped.pdfIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_b91ced4965254a789893018741ee93cf.pdf?index=trueIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_ac047db416bd48d8ae66a78f7967b1cb.pdf?index=trueIn PDF document text
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_217adaf4d1bd4420b177fcf5ec4881a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/guidelines_for_aortic_dissection.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/samsung_t24c550nd_wont_turn_on.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_efe150d720f24a7dadbb3aec7688646e.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_c4f9d9d0a242410d93a998d6fce64add.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 3768 bytes
SHA-256: 501b3c7e9c527a400594bfbd03bf56ffbc83f1615054439d80aa0dddbc627039
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 5188 bytes
SHA-256: fb1d1c0b54eee71c306ee4a6cbceca3178127fa7410429513989337b7fb7b6ab
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 2128 bytes
SHA-256: 0e0259ac06b5e63c9fbbe0b63de04b6375a8b8a1b56afe9f0e4286666c95e82a
font_03_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 14344 bytes
SHA-256: b9c09e805e58d74e38a3530232cef7d91369242252d933539b4e923c940cb16a
font_04_sfnt_off00015abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABD 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90