Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c80805b9388d1c6…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 16:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8ed29914f53e00759355ab66426ebf5a SHA-1: 0f6e4b60ed08205d6cf414dbc90819a2fc836966 SHA-256: 9c80805b9388d1c60241ec13b81e9bfc3445050b1cc7ed6fe85d9c6e19ab96f0
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=straight+talk+mobile+hotspot+reviews PDF link annotation
    • https://jatekokem.weebly.com/uploads/1/3/2/8/132814322/273721e.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/h1_keep_on_the_shadowfell.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Liggiih/pizadujokawudogabadirer.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/data_science_major_requirements_nyu.pdfIn PDF document text
    • https://jivudajen.weebly.com/uploads/1/3/4/4/134470456/c4bfe40e1.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/fepanabazudidimkv9k7.pdfIn PDF document text
    • http://myfavoritesun.xyz/basara_2_heroes_ppsspp_csopspul.pdfIn PDF document text
    • http://espaceabonnes.com/78588811277p93q1.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/80309244575.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/ihEVCkZ/vubapemununosurir.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ffchddR/66872968838.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/multiplication_worksheets_for_1st_grade.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/gunuzozidiruzedenalata.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/iaicOoL/suxakimefuduzowanogud.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/piriformis_syndrome_treatment_for_runners.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/mipivufafet.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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 5692 bytes
SHA-256: 5dbe5277cf82ef984dc95a5759ba7b579deca737486babc48d83fb17460f09a6
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 10620 bytes
SHA-256: 6eab5628fe141dcb11bccfa58de94410ab28aeed5eb2af25ec0ce2c818d15a37

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