Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cd997c97a30eb2…

MALICIOUS

PDF

73.4 KB Created: 2021-05-31 16:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c3be22bda12dc6b5d3e36ab8920e7ed6 SHA-1: ea64eff12a5e1ee378894793e5f1a2b98761a4be SHA-256: e7cd997c97a30eb2af508bfff337ffcd3b259ec8fca0734b91bb2a6a3efe5571
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://laborke.ru/pbw?utm_term=how+to+take+video+with+flash+on+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413121/normal_60688571e4267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fcdac454792c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5fef0d539a6cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d866f04e0.pdfIn PDF document text
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/nazesefagitiviw.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/2136831.pdfIn PDF document text
    • https://koxabiniz.weebly.com/uploads/1/3/5/9/135994092/kazogutomebi-monebifi.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/e1da06601814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451028/normal_600b1dbfa09bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_6012547297f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6014ba7e9df62.pdfIn PDF document text
    • https://tanorejenajid.weebly.com/uploads/1/3/1/0/131071151/nugamokewizex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_605f989b6c05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_603129f79ac51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fe1903517dd6.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/c73bf29c-4e28-420d-9ee1-0121e4b4c5c1/what_are_the_parts_of_a_door_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de53b67-35e8-45cb-bac3-324220eef70f/can_you_get_paint.net_on_mac.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 5212 bytes
SHA-256: 5bcba60464b291c4f9b7ff2f67c370cefa919f561c594aeb9482068a371b3082
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10828 bytes
SHA-256: 8687b2e4a777efb0a00fdfef1aa1328d5b087381f0fcf221b0ceb957a3176bb8

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