Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b8b57e5f3b0a1a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-12 18:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a1e4896f5b3e2f0a133a2b969d7f1068 SHA-1: c9584357ef6348044089a639d7aea475997f9c66 SHA-256: a2b8b57e5f3b0a1afcbf4a028b61b35d5836c7f245553af7cd260d25ad63b3be
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=dragonvale+misfortune+dragon+breeding+guide PDF link annotation
    • https://cdn.sqhk.co/famuxina/uhexggH/weather_chicago_november_11_2019.pdfIn PDF document text
    • http://uscreditinquiry.info/what_are_some_social_problems_facing_america_todayvv9fj.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/7284753.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/ponetibo_mimodudojiz.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/cijDAgh/50102027112.pdfIn PDF document text
    • http://runmasten.online/music_an_appreciation_8th_editionwsjk7.pdfIn PDF document text
    • http://rineset.xyz/202608513425u4h6.pdfIn PDF document text
    • http://kraftmann.su/27017501034k37qv.pdfIn PDF document text
    • http://filanion.online/video_cutter_and_joiner_with_crackq6h24.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/dCgfghT/subterfuge_phonetic_pronunciation.pdfIn PDF document text
    • https://womolikusewafok.weebly.com/uploads/1/3/0/9/130969044/7129909.pdfIn PDF document text
    • http://youtube-subscribes.com/wakekavk0i9y.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/employee_performance_evaluation_template.pdfIn PDF document text
    • http://changely.club/ancient_magus_bride_ep_7ygs8j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/98334240339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3f423f-0965-4be2-9f88-eaa1f8db616d/bissell_lift_off_pet_vacuum_filters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f53e26f-bf50-4580-bcd7-797bb8d221e5/garaseserumebusuxa.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/thetford_rv_toilet_model_42072.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5428 bytes
SHA-256: 90596ba47f7cfb456bbe61a5d040c36de4dfa1096074851ef35e5a8317997d87
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10512 bytes
SHA-256: 305410aea30ed972b7b7d6094b53e8df32b138d8d9b70fb3066c3e1771866e1a

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