Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4a4c4484f86373…

MALICIOUS

PDF

73.7 KB Created: 2021-05-02 23:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d6a7e28affe5f7c27e0fcc098b55f4de SHA-1: 20ad3671e63a342db79c51cc585780b65e40925a SHA-256: 0a4a4c4484f863737ee7f03f54e1762a3960d50305ac20db6a6071d290986d77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xezojetit.ru/strik?utm_term=how+to+do+a+border+on+a+crochet+baby+blanket PDF link annotation
    • http://bejawutipage.mywebcommunity.org/15220079292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417045/normal_6008c55bcee47.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fe2582e54492.pdfIn PDF document text
    • http://hairsprof.ru/pottermore_phoenix_patronus_answers5dpkl.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/EgGrOjj/nofuxabobug.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/lulolowomepem.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ewjdgeI/raiders_of_the_north_sea_playmat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5ff471f70d86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_605f6e5c661c8.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/cbse_class_9_english_beehive_textbook.pdfIn PDF document text
    • http://gbo.guru/paragliding_sim_pckvea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_603e0818bacd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_5fcc18c356c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492253/normal_603639c478bbc.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/43092624729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vokesakogo.onlinewebshop.net/raxupobezarov.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 5208 bytes
SHA-256: 4769926f1bcec32a943dba1d404dd329611b0ca92d3cf8462545f1939ecc67c4
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10404 bytes
SHA-256: 75fa278aae651ce9e342d1e3071a695db2d07b7e1d1a1a190fb53eeb9d7d60fc

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