Malicious PDF — malware analysis report

Static analysis result for SHA-256 9823e345e21d24df…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b05179eb74574f7b448d40c8dac70bee SHA-1: 2cdc35fa32f75a646688ca95d552033923cf35cc SHA-256: 9823e345e21d24df56ae011cb61000323d05f5e87a4e2c8ca22770e337129537
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=what+does+porcelain+doll+mean
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/pibajafezodapot.pdf
    • https://cdn-cms.f-static.net/uploads/4483855/normal_6069383fc1aac.pdf
    • http://fijazubelanulek.mywebcommunity.org/act_practice_test_2020_14.pdf
    • http://pogekoxuw.mygamesonline.org/catalogue_marjane_2020.pdf
    • http://ginixotojaru.medianewsonline.com/balancing_equations_worksheet_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_601330bfaaa92.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/3230669.pdf
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/fedodijemomuxavasazu.pdf
    • https://wunebometa.weebly.com/uploads/1/3/5/3/135314425/9029010.pdf
    • http://mebevevi.mywebcommunity.org/neparow.pdf
    • http://xuxikanewojolaj.22web.org/what_deductions_can_i_claim_on_my_taxes_for_2020.pdf
    • https://jowojijap.weebly.com/uploads/1/3/4/0/134042892/lezukabosolan.pdf
    • http://gisisavodure.22web.org/29014678926.pdf
    • https://cdn-cms.f-static.net/uploads/4495707/normal_605340e2b2636.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/c1177a15d623ee3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vebenok/pobabuxuli.pdf
    • https://s3.amazonaws.com/lodazojamuva/54270117434.pdf
    • https://s3.amazonaws.com/liguwubore/roxawufofupamu.pdf
    • https://s3.amazonaws.com/naxozelozude/balloons_png_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf1.bin
b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 2900 bytes
font_01_sfnt_off0000f634.bin
862a7aab5a9bc47f3037206c2755db443833163ce5366a7d3c240491c057f7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5324 bytes
font_02_sfnt_off00010833.bin
81dc6f6f7c4d8c1623a38a06bd3f75c40df49bfad0ebcf311eedcf6975c089df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 11600 bytes

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