Malicious PDF — malware analysis report

Static analysis result for SHA-256 768feadb54ea65ba…

MALICIOUS

PDF

166.9 KB Created: 2021-02-14 02:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 22ee602a1701944782d1ba4a1b35a821 SHA-1: 4e86971a3cf7c90cd9d3de5ebe1d7738bab6094f SHA-256: 768feadb54ea65ba61860897146ac40dc06bdfbda55e95515c648f12302cee02
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') and containing a 'utm_term' parameter suggesting a targeted lure. Heuristics indicate the PDF acts as a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

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://maypoin.ru/123?utm_term=loudon+elementary+school+teachers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375352/normal_60286be1699ac.pdfIn PDF document text
    • http://tikovg.xyz/spectrasonics_omnisphere_2_manualemw1t.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/980965.pdfIn PDF document text
    • http://iqecoportal.ru/all_pakistani_movies265e7.pdfIn PDF document text
    • http://rowajenuw.iblogger.org/jutokojamikekan.pdfIn PDF document text
    • http://niwujobexev.22web.org/89845693561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420911/normal_5feeeac485c5c.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/modern_warfare_3_survival_mapsqd0uf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_601cb64bafeb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_6018b7b949948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowesuwufurofak.rf.gd/61970982003.pdfIn PDF document text
    • http://mefadagisi.rf.gd/free_durable_power_of_attorney_form_alabama.pdfIn PDF document text
    • http://wefuzage.epizy.com/fizuzukajimilidanalolas.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/battlefleet_gothic_armada_1_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/naloseponizoguxagazonupad.pdfIn PDF document text
    • http://tuwafexom.epizy.com/android_studio_disable_adb_integration.pdfIn PDF document text
    • http://zugumez.rf.gd/economics_a_level_past_papers_gce_guide.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_off00025903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25903 5220 bytes
SHA-256: 3f449aa5c694f8d8cadcbec2dbadd71523bc4525733850f4c7150c4e6dcf3953
font_01_sfnt_off00026a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A9D 10440 bytes
SHA-256: 0d6dd113ea75113c06db4911cea74a951a5a5eaedfcafa72ac50e7ed0281df62

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