Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16949c4da837d66…

MALICIOUS

PDF

70.4 KB Created: 2020-12-30 06:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: af4b23e7311fc93d17d9e8b4f2a2f751 SHA-1: e35f7c9b9a3e69503d06faa0bc217eb942e7d8a3 SHA-256: a16949c4da837d66e2829ea42a9b28a23a29bfc963b5dadcad9e9e68ee62c1fc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain 'trafftec.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution.

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/123?utm_term=lifetime+folding+chairs+walmart PDF link annotation
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/6a1c3d0a.pdfIn PDF document text
    • https://jawokipuroz.weebly.com/uploads/1/3/4/2/134265350/watafovuxodunetutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fa5e6256534d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2b4492e3-ea3e-4507-84dd-cb3e51ae1105/entertech_magic_sing_song_chips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344d184b-798d-4d7d-a05e-633ff0b4a6f9/natural_e_espcie_de_histria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023b755a-9425-4dcf-975c-ff09069ad686/17503325490.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/74197036459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce63fecd-7d1a-45f3-a861-af0b395cf720/defining_the_atom_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/mafawudij.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/45344503920.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/postpartum_depression_management_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8dcc68-5aa9-43b9-8f14-fb820d1007d8/vojozazidese.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/dummy_admit_card_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 5256 bytes
SHA-256: f73552b2e852422fa43b493b8b571170a742633d0d8895361f0b9cccdf42e8d3
font_01_sfnt_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 9688 bytes
SHA-256: c6030e5e1e5553dc53256b0c0227c69e5d7f7838cb5647083a5b9c60fa86d1a3
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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