Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e4405a103f59d2…

MALICIOUS

PDF

78.0 KB Created: 2021-03-09 03:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a78cb09d53eaafdaaca73adbb2fd5185 SHA-1: ebf1ecaa3178f9b4b6a93b4bc03881a849bd3667 SHA-256: c2e4405a103f59d2102354e871ed126630d8c1c10908d0d44dde300fa44fac5e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive link structure. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/wix?keyword=friv+3+car+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458390/normal_5feb8066171c6.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/vexugebegabebebavagutosrwn03.pdfIn PDF document text
    • http://tujugebisuxilun.22web.org/70286749316.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/7490964.pdfIn PDF document text
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/pedaxu.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/5272665.pdfIn PDF document text
    • http://gramnews.xyz/alfabeto_en_cursivaxhscb.pdfIn PDF document text
    • http://subezatedi.iblogger.org/58075367716.pdfIn PDF document text
    • http://worldthailand.fun/after_effects_templates_logo_reveal2t4fq.pdfIn PDF document text
    • http://albatros-trans.ru/how_to_get_a_street_vendor_license_in_new_orleans7m7kq.pdfIn PDF document text
    • http://realwockyc.info/bepilubodilejaddpyl9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_60327f066721b.pdfIn PDF document text
    • http://fruct.space/what_does_hyposecretion_of_adh_causeed5hm.pdfIn PDF document text
    • http://idealica-columbia.site/2013_dodge_avenger_oil_capacity_3.6rwced.pdfIn PDF document text
    • http://xrootunited.com/zejurexerawlzmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_604145c270a4f.pdfIn PDF document text
    • http://godubumoze.iblogger.org/car_engine_parts_names_with_pictures.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/mexog.pdfIn PDF document text
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/62b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_60135b4e149a5.pdfIn PDF document text
    • http://onlajn-kassa.ru/65758398795zfsei.pdfIn PDF document text
    • http://ing-cliente.com/18318590086gdqs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fobegakolu.epizy.com/4441638677.pdfIn PDF document text
    • http://butadiviwev.rf.gd/listening_ielts_test_with_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 4756 bytes
SHA-256: fd1ccd46eb0fdcedaf6c69e955d01e9ebb6f2f189469b1773033b8421781feb5
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 10532 bytes
SHA-256: d3a68f198dc63c062c95edbed851b17d7c13c6d31c7ce4236f481ff0c6ce5054
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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