Malicious PDF — malware analysis report

Static analysis result for SHA-256 3712c6e217e6dc76…

MALICIOUS

PDF

81.0 KB Created: 2021-04-16 08:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: baf7221d484a5979e4aa114528a87201 SHA-1: 11454eb39973d0b68919231f921664d27f1c7cbb SHA-256: 3712c6e217e6dc76acfca1f2f49f07f6a97201fd733f165f46b9d40e88a590de
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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=predictive+analytics+examples PDF link annotation
    • http://winoraama.space/c_programming_a_modern_approach_3rd_edition5cwqy.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/Y7UmAhb/sapadawotabiz.pdfIn PDF document text
    • https://cdn.sqhk.co/digijodaga/hfhggfc/antiphonale_romanum_2009.pdfIn PDF document text
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/19058a2ad085f.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/7864057.pdfIn PDF document text
    • http://usesalon.xyz/boho_beautiful_transform_program_reviewsrzt3b.pdfIn PDF document text
    • http://navalny.design/88495501009bzovv.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/8142512.pdfIn PDF document text
    • https://tuzakipimuvujuv.weebly.com/uploads/1/3/0/8/130813756/8518168.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c9e7ff-5281-4b26-b004-2e610cf4233f/32638846603.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_eb2560dd9942480397adfff88ebd02e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/278765bb-a9d2-4db0-8a4f-1b21076eeb89/pivonowaxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31780d4c-7e00-4235-8c43-17e4e00f49cf/how_much_does_microsoft_project_online_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90de44cf-76a7-4530-9c73-39633e54b15d/58216362016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d05013-346f-46c7-b0d9-35bdf2ed8ff3/would_you_rather_questions_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf30c957-99b3-4a98-a193-ae1c91f2ea05/new_yorker_crossword_century_21.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_6de7f01b295f4f1e9a2fd806358a1a42.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_b1f30ca471864b0da74c397d279343f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3daf059e-2f0e-4ed5-8089-2d4936c9e29b/pixma_mg3520_airprint_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb47f87f-2b4d-46cf-8854-88156ef35cc8/dukaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92d9915-f3f6-47aa-864e-83e94c9f2e22/bumabafejanunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e54e71b-317a-48d2-b956-aaeba532506c/what_is_the_arc_trainer_for.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 5448 bytes
SHA-256: f151a3c0178843b3d9542f1f7ebe355c2e3c7737d3bbf881cce154c8b03cf3e8
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10988 bytes
SHA-256: b2c31278e3504b9f68097be43a94ae0869b2673b714b220e5aafc7734dd07e24