Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7415dce969939…

MALICIOUS

PDF

75.2 KB Created: 2020-12-03 14:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e4371859f69254ebbfabfc385dbd753e SHA-1: 9ae35c136c0ed393d2ca712d3cfd3bb2f53b59c5 SHA-256: e6f7415dce96993905c13a5a002a2415e69770ee847d60a717f90c725e2c2800
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous links to external PDFs, one of which is a known malicious redirector. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=bachelor+party+2012+malayalam+movie+free In PDF document text
    • https://buwutele.weebly.com/uploads/1/3/4/4/134450545/ferugedobesusafuj.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/2635266.pdfIn PDF document text
    • https://vafubetuxako.weebly.com/uploads/1/3/4/5/134503762/302de515ff.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/nelefozarali.pdfIn PDF document text
    • https://gabatilijoden.weebly.com/uploads/1/3/4/7/134730515/125359cc.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/durosi_gikibut_bisafabejen_gugejobojazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f94dd883-abd1-407c-b872-97e45fe1c24c/6063684585.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/compact_manual_treadmill.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/65168010298.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39171c6229360ecbdae8e/t/5fc60b89a97599144ec869c2/1606814602687/wimejapijevebiluninovupu.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/53687368441.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99a0a2757459be2ef6a/t/5fc106cf64571256545ff3ab/1606485713002/travel_the_world_on_exos_ladder_vlive.pdfIn 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 5296 bytes
SHA-256: 37f8348912df1a7aa43a76bfd7f935842d544de8ecd719b5131d875891d9478d
font_01_sfnt_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 5236 bytes
SHA-256: a907c65f46c0fc7fdb11102f862aaeb27df1211543cf828146a2a7bf1f0b7d85
font_02_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10448 bytes
SHA-256: 40429df027eca8fe9598bd86907b4aa1b67ff2b7a98f1f99b636a28aa3a7b8f1
font_03_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2