Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cdff6ed71c31db…

MALICIOUS

PDF

81.8 KB Created: 2021-03-29 18:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: faefb7e6cd3d7bb5f982545821429695 SHA-1: 515ed8ff3a4c75694dfaf007f6ea0b12fea432fc SHA-256: 74cdff6ed71c31dbb49dc0c697eb64a1c1d6fae69eee469532b79af60cee2ede
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9996

Heuristics 6

  • 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.
  • 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://lozipotod.ru/award?keyword=bcs+bangladesh+map+pdf PDF link annotation
    • http://microbestdigitalmeter.xyz/writing_checklist_clipart9j8oc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5ffb37602b6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_605b8516e68f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378830/normal_6002d517e1dff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_600f11d79078e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602c893594e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6038c626dbe7c.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/aspergers_symptoms_checklist.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/merriam_webster_advanced_learner_s_dictionary.pdfIn PDF document text
    • http://optarfes.com/3292623220367btq.pdfIn PDF document text
    • http://ru-payment.casa/53962843957bfizs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5fe92d3971073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_603d41096b52c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_86d38a0d0d0c4cc9868072ebc09baf7c.pdf?index=trueIn PDF document text
    • http://muvekalufisu.atwebpages.com/nadaw.pdfIn PDF document text
    • http://samajusinifako.atwebpages.com/arteritis_temporal_de_celulas_gigantes.pdfIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_2cbc0dfa93544b52ae82f50116e4a7ec.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_2c2ea82fde684306a03590361ea6c7f8.pdf?index=trueIn PDF document text
    • http://dapibudajemuk.atwebpages.com/optiplex_755_sm_bus_controller_driver.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_fc9f510a11d9459baee507d65de985dd.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_e2d466013a45437f832e5277b8850be5.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 5660 bytes
SHA-256: 07f946d5bed43414e1e01227b636dc1b990fa3e216c577b43b0f62d39e3299ed
font_01_sfnt_off0000ea3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3A 14216 bytes
SHA-256: 52155d0c80c327d4643928bcdc0d0a3db0479b8f0e1eafc5ec630dd57fde3086
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 9956 bytes
SHA-256: beeb9a4a5afdac77848465022b777dab88621d6d7bcda73effb9340f1ba0f6a7