Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c25e209f6b0285d…

MALICIOUS

PDF

79.0 KB Created: 2021-05-14 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7665e467cf483f1d299ce059420f2c7 SHA-1: c1489684901364a52116d1be920ffbc10c2705a2 SHA-256: 1c25e209f6b0285d51bc7e454dc3529b60042fad7ae482d7461d6b72dca00004
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to academic materials, which is then used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=myers+psychology+for+ap+3rd+edition+slader PDF link annotation
    • https://cdn.sqhk.co/mawejoxejobe/ibh6iaS/53604533592.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/zomuvefesab.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/zuxebatatubagijesigomuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fc5add1b5322.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/largest_economies_of_the_world_ranking.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/ssc_cgl_algebra_practice_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/4YFjbig/12506122084.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hdhcpje/nugevutukusasid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_600c1683807f3.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/agg6ihl/volavuxazabo.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/0ijgefd/tony_survivor_net_worth.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/learn_german.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/dgfhe1h/warug.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/gdojgjb/22155497261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fe70202ac621.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/binary_search_algorithm_with_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_60233ea15660a.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/iegcSib/bodugodavibepa.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/ehcwtji/wedikevefobekere.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/holland_code_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/jd10PBx/veloxiboworijuwewikekafir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 5688 bytes
SHA-256: 6cce47a06ff9e414502ca481d8fe4d18a59aa6c66fd8664d051ea6d6b77933d2
font_01_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 13240 bytes
SHA-256: 2c9be3ede14c2cdc9b7efbb72b82c3245bd95093abf8605e0b4d036c856aeb93

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