Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8bdacbfd7766b1…

MALICIOUS

PDF

72.6 KB Created: 2020-11-13 19:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fc4ea41148ddba3634671fc9003495dd SHA-1: d72311eec209a57666ac456e4786752e80e0b822 SHA-256: 6d8bdacbfd7766b19f67099298ca8e04301ab0155d71e2e03271b68de6598317
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=empire+at+war+remake+pride+of+the+core PDF link annotation
    • https://luriwopowilexat.weebly.com/uploads/1/3/4/3/134338936/jifibadipu.pdfIn PDF document text
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/3683412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5fa7d381c7c8c.pdfIn PDF document text
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/789b881bdccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403408/normal_5f9c4809c8875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_5fa791522bf15.pdfIn PDF document text
    • https://rajivuwos.weebly.com/uploads/1/3/4/3/134398668/6430934.pdfIn PDF document text
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/d7c8c.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/5065632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5faa13c76f75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fa26a3adaaa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f8b615e324e5.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/ef68d7041a.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
    • https://uploads.strikinglycdn.com/files/f6494fa6-b110-415e-9943-a8f4d96a35cb/bokipalelawibitufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a6682e-ae59-44fe-b283-c3e5bc954211/89135166123.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/hungry_shark_mod_apk_2019_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/osteoporosis_treatment_guidelines.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 4980 bytes
SHA-256: aedf6273b8b023362ff60d223a7595315c02a74c731ca39daaebafb0a76b64e9
font_01_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 10524 bytes
SHA-256: ba4f5340dae1994030a026d08df26e2b08cf3a995e8ca794a6e369c02cfca9de
font_02_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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