Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1d3f6143781b0…

MALICIOUS

PDF

74.7 KB Created: 2021-02-19 07:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e4a4e50081b502e5afd9e6e3a77702c1 SHA-1: fc2e91b8f28c0df85644ecad9bd8a86aea22f7d9 SHA-256: bca1d3f6143781b0cfc70b9d0bc44d428a4f717b180ad9a9ea85b2e3445c650e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to potentially malicious content, disguised with a seemingly innocuous document body. The primary purpose appears to be redirecting users to various external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=how+to+make+glaze+for+spiral+cut+ham PDF link annotation
    • http://pornbustyvids.com/906297309350as32.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/gjygebw/download_thunder_assault_galaxy_hunting_mod_apk_revdl.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/peninuxenonuwiv.pdfIn PDF document text
    • http://modernstyle.pro/shadow_battle_2._2_hack_apk6hdau.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/dgjhgNu/36397105172.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/9igVSCV/50134341599.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/jdd7igp/watch_friends_with_benefits_netflix.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/c3a665812.pdfIn PDF document text
    • https://bulewafaki.weebly.com/uploads/1/3/4/6/134682315/lamalowupetipi-bezelarowulebeb-taroxafifekap.pdfIn PDF document text
    • http://italy50wow.pro/sojuwedoponedivdsgon.pdfIn PDF document text
    • https://cdn.sqhk.co/bonipumijed/jdgcgjE/jungle_run_2_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/dUJgiah/didi_and_friends_cake_theme.pdfIn PDF document text
    • http://healthit.space/85270897198bbane.pdfIn PDF document text
    • http://ozalupa.space/55772230694tfyv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5ff01f53c5344.pdfIn PDF document text
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/5336320.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/g9sWZVE/race_car_driver_accident_today.pdfIn PDF document text
    • http://cashbackmoney.info/paxineswdt9r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 5372 bytes
SHA-256: 55b7884ba12ecb7c9de94e3199fc3617a970581ded8d9309155d609c58787dbd
font_01_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 10976 bytes
SHA-256: afef37cd85664c1a0a647225ada9bfe313f47afbd60b29fc267d247419555ee1
font_02_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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