Malicious PDF — malware analysis report

Static analysis result for SHA-256 7081a9c87e4a2a0a…

MALICIOUS

PDF

80.8 KB Created: 2021-05-06 19:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 785e243dc3291de7988cdc3067007211 SHA-1: 5a395a145333260e77bdd083b8efc3d979a4818e SHA-256: 7081a9c87e4a2a0a88aa6d920a18532fb3f833d95e3087ce0f445437235ded70
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=what+are+the+four+stages+of+film+production PDF link annotation
    • https://cdn.sqhk.co/xuwadezab/hdiiihJ/gun_sounds_free_download.pdfIn PDF document text
    • https://molisepav.weebly.com/uploads/1/3/5/3/135347716/xoxenovetorewe-ginugilepawex.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/da87e580ba.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/7999907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_601391fd2f3cf.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/fogeronasiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_605613480e43c.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/hhidu8A/one_clue_crossword_bonus_puzzle_going_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/316xThj/99895131595.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/GxhbRih/little_warsaw_restaurant.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/carminative_drugs.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/asme_y14._5_latest_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_95bc9350b583424c9302c9d72e48a8e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f39813-8857-4f13-a0b2-4b0d763b334a/molixutuf.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_0177f3e0abcd4f9f961544de4c2a74b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa93853-cfcd-4560-8cae-50f19810f7f6/horngrens_financial__managerial_accounting_the_financial_chapters_plus_myaccountinglab_edition_6th.pdfIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_f31983c857174ff18d3bbe118447bb4d.pdf?index=trueIn PDF document text
    • http://davinawoguzag.atwebpages.com/download_basic_accounting_books.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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5580 bytes
SHA-256: 9f9d442692c44e336c1a81f70b9dc55ab106b9ecc01a6f26f37ea918a2dc50b1
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 11120 bytes
SHA-256: ed7232fbcf550378a406c9271a837d6be7d191ec4528080c749195be7ac5f22c