Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac886f0bfbb0ec7…

MALICIOUS

PDF

86.0 KB Created: 2021-01-14 12:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6dd06aefa8c0ec0c21d05c1ef738c415 SHA-1: 5a3cf0890a65b91e1ab63d66c7f0139972062aae SHA-256: 4ac886f0bfbb0ec722687ecab9e1763fa469a6c15532445407420916586e4107
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=black+clover+yuno+last+name PDF link annotation
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/3257753.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/xezevinitewid.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/1922678.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/mizowidog-jokum-buzovadubuzifo-pofumurat.pdfIn PDF document text
    • https://site-1178385.mozfiles.com/files/1178385/download_pocket_sniper_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f9c7443d728b.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/gatehouse_riding_hat_size_guide.pdfIn PDF document text
    • https://ponikinofenad.weebly.com/uploads/1/3/4/6/134602628/e1ff9b9e3.pdfIn PDF document text
    • https://xezagepu.weebly.com/uploads/1/3/4/9/134901129/6099435.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/8986fa4d47da.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/gebodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fe6ea3ed3d72.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/87a134b9204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f941cbf599b3.pdfIn PDF document text
    • https://pexarokozisakim.weebly.com/uploads/1/3/5/3/135313666/roguberawiv_vovalasuro_kidovowoli.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 5044 bytes
SHA-256: b99186e29e2635aab225b6cd9e0322b89234e4e166b7a16b8fbf9eee7b29ff66
font_01_sfnt_off00010537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10537 5052 bytes
SHA-256: a8ddae68af8f93b5345302eede60cbcab96de41f878ac559cd94e17f06b35a29
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 11500 bytes
SHA-256: c66c3202a13887f2554c6ea5c9fb155c5b59331fcb860e8c9faeca6901234ba2
font_03_sfnt_off00013ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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