Malicious PDF — malware analysis report

Static analysis result for SHA-256 b160e424bed892c4…

MALICIOUS

PDF

59.9 KB Created: 2020-12-19 19:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b74e9850e221b5c92bc310080b4e5bd6 SHA-1: 3ae202f45b985c2664f7b7698a45b0405a7d37b3 SHA-256: b160e424bed892c441b8a3de2211d5a849f23d5526f8175e0f9e8c39c1c21c11
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'traffset.ru', suggesting a redirection or phishing attempt. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly suggest an attack pattern focused on directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffset.ru/123?utm_term=houghton+mifflin+reading+grade+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fdd97bb31df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f9db394928e7.pdfIn PDF document text
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/9400027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5f91ffaac5ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fa57a4955aa5.pdfIn PDF document text
    • https://zumukematil.weebly.com/uploads/1/3/4/7/134716366/81d05.pdfIn PDF document text
    • https://gasagadivegolix.weebly.com/uploads/1/3/4/4/134488570/dimejizemujalasejuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5faee17640ba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fc0d05b04358.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/5fc50c986b97992eb5766a10/t/5fc6409e3570fb44d1d7977b/1606828190468/cc_shamrock_events_llc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce45288eda244dc4acbbd2/t/5fd6054cb1c3f31c7a77431f/1607861580509/lemiwiwesizuk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4fd83485235c86bcf03c/1606373337008/kuzeruzim.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6ffef1969b523a41e2079/t/5fcc4f70c836a917f901f4e0/1607225201362/nasal_polyps_symptoms_in_tamil.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 5156 bytes
SHA-256: b488e75e7a4da5dba056fc3e5808babbc795a62c8339f16b6a02fa1b1b20d4b1
font_01_sfnt_off0000c0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CE 9900 bytes
SHA-256: 3cb0a96e8de946e34c36b312699685a869ef5395e9737da47d8d0920a640b4c5

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