Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5311c8bc5af709e…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 04:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 628b7dc1d6df0367767317d0dd075c83 SHA-1: e8a5f33cfd19206a442f9ffe8c06b23cd88e4bb0 SHA-256: b5311c8bc5af709ec59bddeb152fdc92cfeb3bdab5526e7a0b8301c2bff72c22
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://mezovuduw.ru/strik?utm_term=what+is+a+pediatric+neuropsychological+evaluation PDF link annotation
    • http://tells.fun/tenkyuu_piano_sheet_musicmx2nm.pdfIn PDF document text
    • http://pebogoginugi.iblogger.org/food_safety_program_template_book_nsw.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/formal_business_letter_format_with_re_line.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/fododotisanote-zomojuw-rifugafaguvuvod-nudaxedatap.pdfIn PDF document text
    • http://morpeoplelife.ru/buxanuweledubatoxivomaduapwli.pdfIn PDF document text
    • http://kernig.store/fewurobugebild3ei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_6021ca25edb65.pdfIn PDF document text
    • http://mifilud.iblogger.org/what_is_the_strand_of_dna_that_is_transcribed_called.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_603cca011c3fd.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/bnjaaih/39729916272.pdfIn PDF document text
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/ripezetanixene_vumubosova_jitomaligemej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381971/normal_5ffdfe483340d.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/wukhbif/29522366900.pdfIn PDF document text
    • http://nanolenka.xyz/bevamoxipitauq1od.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_604d141b03687.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigezenefibi.epizy.com/testy_z_czasw_angielskich.pdfIn PDF document text
    • http://dagoroj.rf.gd/59252181719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c9aa56-8b98-415a-a801-9d1d09a81c2c/97562547345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1ad878-2e2c-4aad-945e-a2d89a70057b/cows_pigs_wars_and_witches.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_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 5508 bytes
SHA-256: d1433d81071d48c381b02fe71eca42bf3d566c883cb141d2fa15ee082d5a37e8
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10276 bytes
SHA-256: 7ca1052192f975d4394a96226ba141aec518e7d2e4f4c769295f4cb507c5243a

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