Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f6a73280c39a72…

MALICIOUS

PDF

97.5 KB Created: 2020-11-14 20:04:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8e1c425c79890fcc6c38a1710b348a6 SHA-1: c8c7899df83494805fb1745b6cee381a02dd11e8 SHA-256: b2f6a73280c39a72a612959d38f2151fbf1b1fab43c3fcb39d40d825449467d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious content. The primary malicious URL identified is `https://trafffe.ru/aws?utm_term=buet+admission+test+question+2015-+16+pdf`, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/aws?utm_term=buet+admission+test+question+2015-+16+pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/lavigubum-losijufelew.pdf
    • https://pekafajifazudo.weebly.com/uploads/1/3/4/4/134478446/e60a3b9.pdf
    • https://jatogogiv.weebly.com/uploads/1/3/4/4/134437993/e02587a617.pdf
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/wuxid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zusevamasor/accords_toltques.pdf
    • https://uploads.strikinglycdn.com/files/b167c1d4-1d3a-4946-8281-ba2aa8d93ded/carrier_infinity_system_control_manual.pdf
    • https://s3.amazonaws.com/jixerubowi/36901449526.pdf
    • https://s3.amazonaws.com/tiduro/92052506720.pdf
    • https://s3.amazonaws.com/temujonuwu/physiotherapy_exercises_for_shoulder_pain.pdf
    • https://s3.amazonaws.com/leguvefu/ancient_indian_history_mcq_download.pdf
    • https://uploads.strikinglycdn.com/files/267936b4-b22b-42c6-9841-a7eb90838eeb/5094400825.pdf
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010822.bin
b1660c4baf8df3202a53497168048e890200ea4de1d166da6519f73f9c7cb264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 5752 bytes
font_01_sfnt_off00011bb3.bin
dfb702c1b754f581913f68f1d543bbbfe87e305a061cb4a7f89f9278259f3837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 12396 bytes
font_02_sfnt_off0001413e.bin
83140d36244241613503fe03e6f097b35be295484dacceb0a0eb963c3a2b49e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1413E 12552 bytes
font_03_sfnt_off00016a46.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 4324 bytes

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