Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca3ba03f33ab1d6…

MALICIOUS

PDF

84.4 KB Created: 2021-06-04 04:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a4465718d11f39f1a52f951590ca02a6 SHA-1: 1520a7185da37a50ec415a1a6c9b5f1cba853794 SHA-256: 9ca3ba03f33ab1d6e4614a9999dfcf43ca371978fce4cdf5ac7b686215c96223
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or distributing secondary payloads via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/123?utm_term=emergency+contraception+guidelines+fsrh PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5feb318025249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fff57ad433e0.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/nilemaxodu-kutirifolasujem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_605d6a39a6df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fe7ecb499e41.pdfIn PDF document text
    • https://xepepewidejumu.weebly.com/uploads/1/3/4/6/134669023/sapoju_tikukaweledu_guvifulapewalor.pdfIn PDF document text
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/9155785.pdfIn PDF document text
    • https://warigiwedekepap.weebly.com/uploads/1/3/4/6/134655399/5e0d5104c.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/janoxadurivipa_sonaz.pdfIn PDF document text
    • https://sazetikegiwujo.weebly.com/uploads/1/3/4/8/134895432/dulidonakemubizune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5ff507b18d246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60496b137fecd.pdfIn PDF document text
    • https://dibigisilob.weebly.com/uploads/1/3/1/6/131607467/2948187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490375/normal_6006e7476a136.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/mesewugidupapesav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_603e8c261c94f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_60282519c6dc0.pdfIn PDF document text
    • https://jezafemobad.weebly.com/uploads/1/3/1/3/131383748/9265f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_603c5a9745f2a.pdfIn PDF document text
    • https://luxiwejewukon.weebly.com/uploads/1/3/0/7/130738755/zijoruxanofozude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6067651e6b30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402501/normal_602459f60ff99.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/4591811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_6019ceb0d0a27.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 5508 bytes
SHA-256: 608a4f2b6ab9ec2773e1480940fca28e5352e60786b9639e6323bcbdc57de55e
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 11344 bytes
SHA-256: ec09de9549efd4c4e25c62535241222b34d6b2da7d30343a09b81ce54049d19b
font_02_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f