Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6c20a29b558636…

MALICIOUS

PDF

82.1 KB Created: 2021-05-30 10:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 94e4d6ea55a3472385e0b37ce6743e4f SHA-1: 7a75f971135610f14ac6e64af6b82527f647cc5a SHA-256: ce6c20a29b5586367d23902b747f7e6db2cecdb603d2c4ac102b45472672c1f1
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, indicates a lure related to physics exercises, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=ejercicios+de+movimiento+caida+libre+resueltos+pdf PDF link annotation
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/8464064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_6014a297f3678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fd6552704e90.pdfIn PDF document text
    • https://benaputilog.weebly.com/uploads/1/3/4/7/134707665/cae25.pdfIn PDF document text
    • https://jajoteraluwem.weebly.com/uploads/1/3/4/1/134108878/8101350.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/kejimijodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_602a72357d265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcc25006ff99.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/2916842.pdfIn PDF document text
    • https://mumojugaweweran.weebly.com/uploads/1/3/1/0/131070520/wozasalanonil.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/kigorofogoxarek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60308aea66316.pdfIn PDF document text
    • https://durabikat.weebly.com/uploads/1/3/4/5/134512276/14622adb4713e.pdfIn PDF document text
    • https://namerodedisa.weebly.com/uploads/1/3/4/7/134771167/5931805.pdfIn PDF document text
    • https://fuzitadixasixo.weebly.com/uploads/1/3/1/3/131381677/tomat.pdfIn PDF document text
    • https://duzemefoveraro.weebly.com/uploads/1/3/3/9/133997208/ed52a1b6149427d.pdfIn PDF document text
    • https://gefeteki.weebly.com/uploads/1/3/4/3/134310298/newafuradix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_6027d1222cff9.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/pasoxusadoropiv-ditajabuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 5536 bytes
SHA-256: 565e6c9dd3d03f9c06fbaa99cc08207dba4dc9418927b35b5b99cd2b7e6e2f3a
font_01_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 12180 bytes
SHA-256: 5fac6d87938c8a5e7f6e28a3355422dacff74bf52935ed903aba775209351bcd

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