Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e3bf65d88d5338…

MALICIOUS

PDF

30.8 KB Created: 2020-11-07 22:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e56030fb01b641fd5df2b663e82649de SHA-1: dc07fcaa951306afe0abdfea9edc837da6c981a7 SHA-256: 16e3bf65d88d5338d1844c558a16841786734417c055d83195b3e3154fd32a40
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is identified as a lure, likely intended for phishing, by presenting a screenshot-like image with embedded clickable links. The document contains a large number of external links, many of which point to disposable hosting or link farms, suggesting an attempt to distribute traffic or obscure the ultimate destination. The primary malicious URL identified is https://traffine.ru/123?keyword=nellis+auction+phoenix+glendale+az.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 30 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://traffine.ru/123?keyword=nellis+auction+phoenix+glendale+az PDF link annotation
    • https://sotodivejezaze.weebly.com/uploads/1/3/4/3/134391575/2154052.pdfIn PDF document text
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/mezifod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_5f95ee0a618a3.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/jubiferekaka/the_living_environment_review_book_answers.pdfIn PDF document text
    • https://tonevixoleji.files.wordpress.com/2020/11/37795021862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5100bda-2745-4f83-953a-9617aa9e332e/54864733029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec91d858-7c2f-4667-ab54-9193a1192290/lutiwofuvupam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6614840-e935-4576-9ab3-3fc9298670a5/army_national_guard_suta_request_form.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c1ee27-ddec-4b57-b95c-806f262b0aee/nigowuferagezedukuxokafir.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/all_might_rising_dub_free.pdfIn PDF document text
    • https://luvomax.files.wordpress.com/2020/11/80415048786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d3d88c-5cac-4f9a-a8c1-8243b656687e/49514702821.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_off0000409b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x409B 5328 bytes
SHA-256: 4b159d60d66e6fe959fb5c7fcbce971f9f2f78b2c6801f94d8b0527518c99459
font_01_sfnt_off000052c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52C9 8128 bytes
SHA-256: b21e392fdb6a2398df82371c15bcf242ac20a398976fc070580ad1abf7882e38