Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c7ccf983a98b60…

MALICIOUS

PDF

75.6 KB Created: 2021-01-27 02:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 29dd23328fce94762664e62c84885962 SHA-1: c2d0adb42d32bbfe39803de7906c127bed97d49e SHA-256: b7c7ccf983a98b60414fc55b86305d41234e23c7f842d388471fb92c00e18460
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, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/123?utm_term=nc+medicaid+clinical+coverage+policy+8a PDF link annotation
    • http://vezagoxutejoza.66ghz.com/upsc_2019_answer_key_set_d.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/4818645.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/zuxit-xivavo-rakudimivepuvi-kubaz.pdfIn PDF document text
    • https://jilazokezabise.weebly.com/uploads/1/3/5/2/135296918/vogoba-vikuvugotujejuv-robemebafulo.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/xoxefefosiloxada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fe7968fb50e4.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/bodexofax_nituralapufubo_tikaz.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/sinamixuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5ff3923bd069d.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/6632094.pdfIn PDF document text
    • https://muxavitegujun.weebly.com/uploads/1/3/1/6/131637584/6d7bae5.pdfIn PDF document text
    • https://garixapevawena.weebly.com/uploads/1/3/4/4/134495328/48c2900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ff65d0433be5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427504/normal_5ff176de5bfa1.pdfIn PDF document text
    • https://fagadiroduk.weebly.com/uploads/1/3/0/9/130969360/xukurekefe-xamef-xojen-botoxigejazasem.pdfIn PDF document text
    • http://gakarefutejet.iblogger.org/audio_editor_free_fade_out.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/1769901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufeniwa.rf.gd/90601719643.pdfIn PDF document text
    • http://tujiritam.epizy.com/commandos_like_game_android.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/binary_to_ascii_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/game_templates_for_storyline.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/biochemical_tests_for_bacteria.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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 5540 bytes
SHA-256: cc5c3ffc58833d686f76398b8218ccfa2d34905caf058c2ed45790d5760a1423
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 10564 bytes
SHA-256: b5ee34c7cb0265694986e19edf2e6025d6675b7656d76093e5d8f4dc21f66dbf