Malicious PDF — malware analysis report

Static analysis result for SHA-256 21002ffc23ae6e79…

MALICIOUS

PDF

80.3 KB Created: 2021-04-30 17:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b215610f1074199d1bc8d8a78511c35d SHA-1: 6d90a2b0304841980eebec71d4f0b545e6ae0667 SHA-256: 21002ffc23ae6e79f791e51032c94ce7c1e2f17ca796273fadd550b0d3e51cd7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these linked PDFs. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=how+to+do+nothing+with+nobody+all+alone+by+yourself+deutsch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412895/normal_6006c7265a8f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_601481b114bfa.pdfIn PDF document text
    • https://xudufuzed.weebly.com/uploads/1/3/0/8/130815664/tobekovizujeke_kabawutojobep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6038406a06bd2.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/wghhjGT/36168401065.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hanghLO/tank_hero_fun_and_addictive_game_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/hbchjih/28922227468.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ijydKll/happy_tuesday_fall_images_and_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/jUgfJji/free_gems_hack_coc_no_survey.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/hi5cHid/adblue_safety_data_sheet_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/tjjOPSx/american_civil_war_dates.pdfIn PDF document text
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/e9f85ba7d3fdf4.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/cc973c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464542/normal_5fcd612014795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekofixas.rf.gd/friedel_crafts_alkylation_chemguide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bcb340-d211-4775-aefe-a6be769d31df/citizen_e820_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16304a0-d834-45ef-a14a-cd5067b7d62c/73250721351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa70d87-a782-4b17-ae3b-779417dcc5cf/lowapudunivaxofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d2ea9c-c033-4762-a4c0-a67100cca2ea/57502770822.pdfIn PDF document text
    • http://notavos.rf.gd/zejema.pdfIn PDF document text
    • http://sivabesu.epizy.com/printable_hogwarts_acceptance_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c617f2da-a8b5-464b-9311-a00ab29ecc49/54819610409.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5580 bytes
SHA-256: 30744a369d7188a7c0bb834d4d0df608e87e7d800c748bdc70dce4a7c21ce916
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 11124 bytes
SHA-256: 5fe67cbc3ed0c3d101dd46c6861d7b3a5dcf059ef417aac136cc965daa573b69