Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da04029296fbe23…

MALICIOUS

PDF

68.2 KB Created: 2020-12-16 11:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 829bf02a98476d332b63b95e5f4e390c SHA-1: d2b4fdce79f9847f66d9229ffd4ab2ca19726129 SHA-256: 1da04029296fbe2350199204560fff95a1754540849b0352f9d35db4d8898221
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which are to benign documents, but one key URL, 'https://trafftec.ru/strik?utm_term=p265%252F70r18+sam%2527s+club', is flagged as suspicious. Heuristics indicate this is a PDF link farm designed for SEO, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were directly extracted, the structure and suspicious URL suggest a malicious intent to redirect users to a harmful site.

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://trafftec.ru/strik?utm_term=p265%252F70r18+sam%2527s+club PDF link annotation
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/4121088.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/a57442433c.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/wonoti/caltrans_highway_design_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/nopoleforegenumipabuludim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d174f87-d8e0-4868-b5c3-643228605bb6/the_hydrogen_atom_student_guide_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/black_seed_oil_tonsil_stones.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ce31d26ff1194f9586a7/t/5fcddae0c836a917f92f2309/1607326433178/46988625018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64900084698658e82fac3/t/5fd6c36f5b1f6f7539e5f98a/1607910255880/visual_studio_code_formatter_sql.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55556bdb33045eedfa18c/t/5fc763347995075abde386bf/1606902581807/tukumodopajazil.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28709affbf90a66f4d793/t/5fce37f7d336b863f0ed595e/1607350264165/49777845888.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/67728818446.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b2643dfdd95b60f5e80d/t/5fcf80925c8977691e3e9e76/1607434396199/gekovitotitafapajujurugok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6731073c-b422-4905-a38b-47bbaaccc196/xekolafasegovutozare.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1bb67bdb33045eec822d5/t/5fd052211c49363a9b4769aa/1607488034572/slime_simulator_app_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add2104edf1d77a1d016/t/5fca693addf0471db5d4dd31/1607100744688/dufuwalukise.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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 6036 bytes
SHA-256: de2ad08089185a2e0cd96bd66397df32ab3e9da2d72da147de516b510db05bdf
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 10916 bytes
SHA-256: 9b5ab8a77015476c7e672068e97ecb260e505ebd9acb8a98960350b45f4e31e9

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