Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5c9b8d614fde21…

MALICIOUS

PDF

66.0 KB Created: 2020-12-03 09:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 083c869c75d212b7d0748d4d2cbce1f8 SHA-1: de1cacd38655bd5bacfdaa3fc1d31091a6e32410 SHA-256: cc5c9b8d614fde21e0d4fb1df1e5f995d6b64c981e859efa18fb47b32e99432c
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-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://traffnew.ru/strik?utm_term=inferences+worksheet+3+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fb29a247a2f6.pdfIn PDF document text
    • https://bafobuxog.weebly.com/uploads/1/3/4/3/134316473/0ac32421f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_5fa12588b703c.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/3765466.pdfIn PDF document text
    • https://xujiwedebul.weebly.com/uploads/1/3/4/3/134317386/f36df.pdfIn PDF document text
    • https://siveruvamavekug.weebly.com/uploads/1/3/4/2/134266289/3606981.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/907533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_5fad37824607e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotenu/fimonaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1ba5f5-8bed-4108-82cc-7c5e61a9ae7d/55555563216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a342de6-9994-4e2a-a7e8-d296ed8a1db4/64617160768.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/nelakovodonuma.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12a1c9698b02c7f224c6f/t/5fc371f03c02f22b9d792d27/1606644209977/destiny_2_wayfarer_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 5260 bytes
SHA-256: 103d1f9df00526925a56f0f65d2dc0723393270d99d4975cd551b984d433e27a
font_01_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 9928 bytes
SHA-256: b6de0029562001fd8dc146140ad52649b1571cb89ad40202e69bcd2ed4545a96

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