Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaca1090d2a5918…

MALICIOUS

PDF

80.2 KB Created: 2021-03-12 03:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6d3eb4d5c9ff0ed475176f41d73e9c5 SHA-1: e0fe034538a00ca9e1957cad97c054d5c2b3ab2b SHA-256: bfaca1090d2a5918ec1a99251348e9790e0a2eb396d9cfdcb0e31bda0cfa2d9a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely leveraging techniques like spearphishing attachments to deliver this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=bise+sukkur+inter+result+2020+pdf
    • https://cdn.sqhk.co/jomutepe/khaGYjg/wyze_discount_code_january_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4375705/normal_6043080a2e2b8.pdf
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/bavid-togexirovitotax-wakipuru.pdf
    • https://cdn.sqhk.co/japivuwali/Qxifjan/yalla_free_voice_chat_rooms_download.pdf
    • https://jabefebilinoke.weebly.com/uploads/1/3/0/7/130739415/838d43.pdf
    • http://smeshnoykir.space/harry_potter_und_der_stein_der_weisen_hrbuch_download_free3d3qw.pdf
    • http://copyright-central-media.com/star_wars_d20_revised_core_rulebookiu4i6.pdf
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fc8101147b48.pdf
    • https://parixaxagutu.weebly.com/uploads/1/3/4/4/134465429/126436.pdf
    • http://shop-profildoors.ru/perfect_piano_game_y8qmkzh.pdf
    • https://cdn-cms.f-static.net/uploads/4379500/normal_6021f1db8aa8f.pdf
    • http://reduslim-officialsite.site/arcform_design_build_ltdhg52p.pdf
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fc84262a0723.pdf
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/4260679.pdf
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/1f12babbe3f2.pdf
    • http://buybritishcat.com/ataide_e_alexandre_musicasoctlk.pdf
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6030911487bb3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b4e5e8d5-201b-40e8-8a8f-165d5f42db9a/animators_survival_kit_by_richard_williams.pdf
    • https://uploads.strikinglycdn.com/files/d5f44cdc-25b7-4bcb-a72a-a121862abc48/how_do_you_calculate_calories_in_dog_food.pdf
    • https://uploads.strikinglycdn.com/files/030f4f86-d2b3-400e-9a42-9258b628e13d/hisense_300-sq_ft_115-volt_portable_air_conditioner_with_wifi.pdf
    • https://uploads.strikinglycdn.com/files/38d395c1-28ae-4eea-b729-1a9e759d2c19/46351002525.pdf
    • https://uploads.strikinglycdn.com/files/e6291a07-7908-4302-b858-26d90b3670bd/chicco_buggy_liteway_3_jet_black_review.pdf
    • https://uploads.strikinglycdn.com/files/b634830f-9522-4d1a-b8cf-f4624026a9fd/45805736744.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b4.bin
dc75c447f7a2b21bdd3761362ef76c497cb26609c974d0abd8186dc788f15bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 4984 bytes
font_01_sfnt_off000102b8.bin
47a889ce973fa50a3922c375226022b3f525ba37120f04f299d7558c1bdd1c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 10136 bytes
font_02_sfnt_off00012572.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 4324 bytes

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