Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846dda8d3c7fbb7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 23:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aaaee31a3915e4f4276a578b901e756 SHA-1: a0a87a4a93e9b3abd8c886fd1bb8e1089500e119 SHA-256: e846dda8d3c7fbb72145ccc1a4ad6eea265624034d23a985e3964468b0eea777
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=how+to+solve+megaminx+third+layer
    • https://cdn.sqhk.co/merabuvi/i7hjeyh/74843562735.pdf
    • https://bukudemedu.weebly.com/uploads/1/3/1/4/131483547/jojagup.pdf
    • http://naturmilans.fun/82323705276ghdrc.pdf
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/wumerawolopupaj.pdf
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/kamumuboxipomal.pdf
    • http://giveaway2020.info/toy_claw_craneczcok.pdf
    • https://cdn.sqhk.co/subetudagoli/jchedWV/tamil_rock_songs_ringtones.pdf
    • http://helpverifybadges.com/what_is_the_meaning_of_efficiency_unitpls6z.pdf
    • https://pigudoxuwupif.weebly.com/uploads/1/3/1/4/131437670/norepi.pdf
    • https://cdn.sqhk.co/felolavap/hhlhjja/xawudumadopixeguva.pdf
    • http://lnstagramsupportinfo.com/civil_war_battles_1864_september6ca34.pdf
    • http://hesap-al-sat.com/kilinu04fou.pdf
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/rinetogume_tejalogifasovu_jibinaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/35769962159.pdf
    • https://uploads.strikinglycdn.com/files/3dbf7323-84a6-4b37-9590-4be87e4e9d39/94236492385.pdf
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_cdccbb904ae84372986db487d6bd36cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c770b7d1-6150-473c-afb7-e9b5532e5ed0/felukasotakuludug.pdf
    • https://uploads.strikinglycdn.com/files/c75851cc-5879-4358-b370-9de12c42c826/71508789484.pdf
    • https://s3.amazonaws.com/sowirutelevolur/mirap.pdf
    • https://s3.amazonaws.com/ganubifirigevi/free_ppt_templates_free_with_animation.pdf
    • https://63dbeab4-18c6-4677-a808-17cd77aec119.filesusr.com/ugd/963d80_2798a3d632bb4be980a074b05aee436b.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_fc778e98247b46c8a18e4eee80f3f493.pdf?index=true
    • https://s3.amazonaws.com/gotenukevepunin/35882819864.pdf
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_c74f0d7017b740b894a719ed7dd184ef.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_fd0c17bf851f46f38df81d72a128d26e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a2.bin
0f6efcbe1f7bbc39f48288f74c9488d6d7d7ecc5311d239bb03c356a4d96a8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 5524 bytes
font_01_sfnt_off00010553.bin
4067a6d9cd56f7dfa1e16cf1f7922668f8825ddd4bebb226df91843c390cddef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 11196 bytes

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