Malicious PDF — malware analysis report

Static analysis result for SHA-256 6345131fa3750c97…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 18:06:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 439cb7766e9e68137c04d940be7cd39d SHA-1: 1fcb25845ffa8db03ddd07048999b1499c8653c7 SHA-256: 6345131fa3750c970ad434a416cb889a3e91ff6c12be285b16a5f766b3bc2024
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The primary URL, 'https://jottigo.ru/strik?utm_term=does+boston+market+have+chicken+soup', suggests a lure related to a common search query. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=does+boston+market+have+chicken+soup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408866/normal_603c0edfa4e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_6048ec3d16ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fe74db8242c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe0704e2bf2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6014d79fcf03e.pdfIn PDF document text
    • http://lazakefezives.mygamesonline.org/ibn_battuta_travels_in_asia_and_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478927/normal_5ff1bc21d5b3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5ffb4b485afdb.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/how_many_chapters_are_in_chronicle_of_a_death_foretold.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipanizi.myartsonline.com/31167842188.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/u_verse_tv_guide_today.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/aha_clinical_guidelines_coronary_artery_disease.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/bls_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/64720349641.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/embedded_c_programming_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/cisco_press_ccna_routing_and_switching.pdfIn PDF document text
    • http://segalemu.epizy.com/45478585934.pdfIn PDF document text
    • http://dejifiragilu.epizy.com/migliori_siti_streaming_calcio_gratis_android.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/data_dictionary_in_system_analysis_and_design_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/bts_love_yourself_answer_full_set.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5404 bytes
SHA-256: bc36424c7405d0cffa8ba354b12dcd69861578cc65ebd73a60c4d594cd18c0d1
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 10556 bytes
SHA-256: 28594ffb7ba50168190a000d7e3d47e7f5bbed61b470faa3aafd26df016b2a05

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