Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f22ce5b02dd818…

MALICIOUS

PDF

76.4 KB Created: 2021-05-21 03:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc3f276dad4d2623c7bdcb009c8f17f1 SHA-1: df684b9490816f9d3447276c84fcbfd4ecd940f4 SHA-256: 79f22ce5b02dd818f041d1fe5dcf0a4d1df6515741ade5f4a0cb9140d6177993
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://midufefew.ru/strik?utm_term=always+with+me+spirited+away+piano+sheet+music+pdf PDF link annotation
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/c624bc7b09.pdfIn PDF document text
    • https://xavagozewurele.weebly.com/uploads/1/3/4/5/134583143/tijoxiveveziba-tetejufotipiru-doratajas-vurudigudimu.pdfIn PDF document text
    • https://ralokokotozupar.weebly.com/uploads/1/3/4/3/134340958/nilasevinipese_ratodabixa_witupexukuberer.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/vipoxewen.pdfIn PDF document text
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/7208466.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/1455317.pdfIn PDF document text
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/5147570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_600ad7e06cf11.pdfIn PDF document text
    • https://fezuliba.weebly.com/uploads/1/3/6/0/136056139/vanogoja_fopevawujuro_dawivevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5ffcc3abba16a.pdfIn PDF document text
    • https://tewawabuse.weebly.com/uploads/1/3/1/4/131437503/gidisidiv_zeviluzeruvuge_zagito_nabaxemikela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/403c7e25-74f9-404e-815b-3385ccee66bd/the_teacher_from_the_black_lagoon_book_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad9eeaa-5a57-4c37-8889-6d5804a36763/jeguxutidegofotabot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a31cbed-ebf0-412d-9a23-9b3e7fcca55e/22348260166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2862180-d64f-4048-9cbf-e935a318aa20/roxuvozekenunube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79fbca7-6e6b-4df3-9a34-4b085718dca5/bevegatejak.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_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 5580 bytes
SHA-256: 9a833be1a2d5d0ad0a65c00bc54ea3f1d08de0009d6f573773b33760ca737c76
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 11020 bytes
SHA-256: 895c5348b72ad86e1df28c86040137c2c9c4f6e510f824a60f74dc8eac6d6c35

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