Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9ff860c3b035d0…

MALICIOUS

PDF

65.6 KB Created: 2020-12-18 03:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 290b01ab1f5cf565f191d6f6ce3082d1 SHA-1: 5ee487a820f1d0628841ea8f0269508912b89ede SHA-256: 1b9ff860c3b035d047c834d69aee0db940fe76a4218b74b4fb893de2e815a912
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The presence of embedded URLs and the ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=get+air+eugene PDF link annotation
    • https://nubagusajol.weebly.com/uploads/1/3/4/2/134235051/5995762.pdfIn PDF document text
    • https://bubokadorododu.weebly.com/uploads/1/3/4/7/134758236/8921253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fb54e4dc4bd8.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/d97fbf3052c2da.pdfIn PDF document text
    • https://vevifogenumij.weebly.com/uploads/1/3/4/6/134626850/7662575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fb5e4e3da96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f8ffed5a49cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd09b1b4c4d833b8bf55aa/1606224310082/98690072384.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a3f3d26ff1194f7eeae9/t/5fc389373c6ccf69f3cbef37/1606650174042/fremont_county_iowa_sheriff.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7281a579eee3ae06c48d5/t/5fd0e43b06d21916ed79a92f/1607525442647/72932926297.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f028f9866f3fd2d48e87/t/5fcc499d74a40730fb8dcf3a/1607223714740/buzibatilexija.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71f59c43b17119888dce2/t/5fca0e023ff94c207e0fc618/1607077379791/movuzex.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dcbf16f6d44b07e099ec/t/5fd69f1cdca22152604b8d5a/1607900956653/cardo_packtalk_duo_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c07f92c50b1a1e98aee2/t/5fc825c28eecd53e39def3d3/1606952387808/reckless_racing_2_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/41269742841.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/57793127804.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_off0000c3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 4672 bytes
SHA-256: 84e94a06d34ee7d285368e608a9d1ec5fc1fe7e0520f5f6c7ca57fc6f547fc1c
font_01_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 11208 bytes
SHA-256: bfb42e70361293d4da703f1d0e9f72aa5edfee5c2589822ec96d36231e3ab745

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