Malicious PDF — malware analysis report

Static analysis result for SHA-256 624515451c6f36db…

MALICIOUS

PDF

79.8 KB Created: 2021-05-17 14:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2a861842146677c6d9b4c868f56e9299 SHA-1: 9af3e0be35335b9fcf2e49d8ed469f76b6eca3cf SHA-256: 624515451c6f36db3ace3575a81717ad353f3f326c3c80a05578a40c3693ef1b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to be a lure related to technical support, aiming to trick users into clicking on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=technical+support+interview+questions+and+answers+for+freshers+in+dell PDF link annotation
    • http://liolika-rsya.ru/chapter_8_biology_study_guidebm4cg.pdfIn PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/4985693.pdfIn PDF document text
    • https://buputulu.weebly.com/uploads/1/3/0/7/130738697/miritujurowoz.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/betijefudozovekaqhukw.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/117736a1.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/wabotad.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/5471493.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/javedi-vuwutivokobo-pabofori-gozamuwa.pdfIn PDF document text
    • https://mixadawobavaw.weebly.com/uploads/1/3/5/9/135982386/xejitorowelejaxor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_bd3e899f026445c3b5563fdd3c1cd656.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_3bd517d0214547798e6abb3c548609de.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_c0d516c3aaa249febd2a42e023a54b5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/country_dance_songs_2019_2_step.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/995000507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2889612c-4d6f-4166-af6e-9cb6ef80e275/66880056514.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_3082f107b37f48688dcb832f736f404d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4057876b-35db-4f0f-9045-1006010d1bf3/sodastream_cylinder_walmart_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f34d44f-424d-43a5-88a5-5a0cce6d1cb7/how_to_unmute_my_alcatel_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c48e27-5c94-4dd5-a32c-37a3c7b37f27/70005528403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0b9e49-2772-4225-a31c-7e6a8108753e/how_to_fix_hp_photosmart_7520.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/fimusibezaluv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 5352 bytes
SHA-256: 41e459b7a3ad83fcd213753c3ac78ef87fafa078823efd647886568c85cda5f2
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10648 bytes
SHA-256: bd53944df8bb87f5340d21a1f8623508fea42c4c6938efec029d8e5282299540
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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