Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4453c7b4217b297…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 01:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ccc631f94222b5a54aec3a7b2e61c6b SHA-1: ca517a5a01db7667fe1b05b8ec52a2fd53ce11ed SHA-256: b4453c7b4217b29756101604fe94769103249e45ebd2350f6c45609d2148b6ef
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://jottigo.ru/aws?utm_term=how+to+crochet+a+blanket+for+beginners+easy, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/aws?utm_term=how+to+crochet+a+blanket+for+beginners+easy
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5ffe9a27b6678.pdf
    • http://fapasevusiledap.mygamesonline.org/70575005703.pdf
    • http://namixojebeku.iblogger.org/sea_waybill.pdf
    • https://static.s123-cdn-static.com/uploads/4495039/normal_5fcc36502b5f8.pdf
    • http://lebedugipul.mywebcommunity.org/miveditasomopemavag.pdf
    • http://mijudivoxobo.iblogger.org/sorupusokebopololubo.pdf
    • http://zodelem.mygamesonline.org/cs_lewis_miracles.pdf
    • http://situvupumu.medianewsonline.com/rolagonelulutonusufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_d2e0df8af8a947478762f6c7816b39a5.pdf?index=true
    • http://mizozibobekujul.rf.gd/contractions_worksheet_for_grade_5.pdf
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_f4c90e060aff44aa959b3dea7c2f0293.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_d7ffcbef6aaf4c4da2778572d374086b.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_059a4cc4d9b04c64b05f9cce3ad5cdfa.pdf?index=true
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_33a9847ca1604c18831826de046e3ca5.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_61b151f7447342d4a402e6fa84e7267b.pdf?index=true
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_f8b3132b43534315b2a85104bb837cc4.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_b95f7904ee7a4c209ee0c47749f14f71.pdf?index=true
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_a6bd390d0ca2429babbadc4482859410.pdf?index=true
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_320df51cbe134c63a6cf9cffd80f3f36.pdf?index=true
    • http://timagugovoxo.onlinewebshop.net/60526357095.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49f.bin
5b6273b8f4af74329a39a63a0756cbe1545dfc9d77b503b4d421ab99c9ef5ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 5504 bytes
font_01_sfnt_off0000f76c.bin
3271d9e8819e5217a51f332f934796e13904255a96df2bcbe32d106eab83523d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10688 bytes

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