Malicious PDF — malware analysis report

Static analysis result for SHA-256 912a8f60a88ac6b3…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 20:21:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2be632afcb07043a3b898acc677b0247 SHA-1: 14e2ff7923d60c461dd41b042404018d68581998 SHA-256: 912a8f60a88ac6b3153345258c2c2b7a815bafeb8fb493e208b72639057b5b4c
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://gimoguvi.ru/wix?keyword=we+never+close+sign PDF link annotation
    • http://torchqbfl.fun/99224161891js38a.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/zesuto_pewepi.pdfIn PDF document text
    • http://digtalcaliper09.xyz/google_translate_app_for_desktopw736e.pdfIn PDF document text
    • http://wisecreditscore.info/636163142430hbri.pdfIn PDF document text
    • http://g2am2e.xyz/blessings_laura_story_sheet_music_freevfogy.pdfIn PDF document text
    • https://lameperitilexi.weebly.com/uploads/1/3/1/1/131164355/5f8f7c8.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/panalipolifod/garen_9._20_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/can_you_teach_yourself_brazilian_jiu_jitsu.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/dukinado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf87406-00c8-41b1-9804-7fbcedbf40d9/how_many_carbs_are_in_a_burger_king_chicken_sandwich_without_the_bun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b629104c-38fc-4e75-a99e-6dde09c18e9c/pubuxuwazog.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_5af08681a9a64102ab7d1587de2e1825.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26f499e-5806-4bb8-b6e8-c6ffd152052a/wufenuwukaraxojetad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ae0cf6-7ee4-4d2d-8ce7-40fc11543d0a/good_sketches_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3f1505-c7d6-4e09-8edf-3a38ca0a7a6f/18975943608.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_98052f7d13444461bea05620202c5307.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/119f8f6f-05dc-4762-8e52-a7e9ed477da0/how_to_draw_on_the_right_side_of_the_brain.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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 4832 bytes
SHA-256: dcb16c1db7d4dd6bc1697cd8875224bf7437c98d3a019459f6267c994e28aecb
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10972 bytes
SHA-256: f68ce2fbb0ef59dddd27426c1c08ecb4791cdb5543630f241b8339305099d2ee