Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11caf96b66114f7…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 05:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf20f801531cebc35466d0236d24e569 SHA-1: c5dee24fdc786676503210f9e5afe7689ec50e71 SHA-256: f11caf96b66114f78f5b37bebeeaa81ad2bfd1848a2ea7995165e7acff43c117
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious sites.

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://jottigo.ru/wix?keyword=figurative+language+worksheets+2nd+grade PDF link annotation
    • https://dagolitufewanat.weebly.com/uploads/1/3/5/3/135345669/mefamamomede.pdfIn PDF document text
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/7843712.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/ratovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6015ee4172086.pdfIn PDF document text
    • https://cdn.sqhk.co/zikonidenijo/ijhtnRD/puzzle_glow_brain_puzzle_game_collection_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/ejigcGU/crazy_race_game_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/oyjcgjz/revenge_of_warriors_hack_money.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/wozopubolik.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/kavofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/san_diego_backflow_test_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/11885767128.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/horror_violin_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/collision_theory_questions_worksheet_answers.pdfIn PDF document text
    • http://janenukexozi.epizy.com/fijarakuzikamajajisiwolo.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/lobipowejon.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/45961968412.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 5388 bytes
SHA-256: 5bc2fc30310764984a5721f0c083135a08bff03ec467b71767bb781188bceb84
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 10480 bytes
SHA-256: 2e2380d728f02afff971012f4fb71b2029e453e70aae379b03e659f7da5e82c3

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