Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa5376aef65c2c2…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 19:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e70cd900fc9493fda53571585d424d6d SHA-1: cadef67429f6cab7625321736618c7ccf0f7a011 SHA-256: 6aa5376aef65c2c22d42d8abf5e0af5cb7bb2ae3670950fce4a364ddbfa0ca06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://baarspo.ru/123?utm_term=robert+greene+laws+of+human+nature+book+summary PDF link annotation
    • http://luxasireku.sportsontheweb.net/dofipi.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/ruxuwawebevuzevanetojux.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/30431605966.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/8878008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_6019d9ca2c6d6.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/nopotafatox.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/jokokalemo.pdfIn PDF document text
    • https://gimoxawoja.weebly.com/uploads/1/3/1/3/131380550/ruzowi-buxitasowen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff003ed6f8b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_600fb57c9c8a8.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/tiwarukezesupa-vefugo-kabupujuroxa-dobesofima.pdfIn PDF document text
    • http://nubolutlion.xyz/how_to_use_imovie_on_iphone_for_beginnersi37l8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fcb485395319.pdfIn PDF document text
    • https://zomasaxejis.weebly.com/uploads/1/3/4/3/134325580/d3891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/lupubazumemubidoru.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/serious_illness_conversation_guide_ariadne.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/9023165111.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/fifty_shades_of_grey_2_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/subject_verb_agreement_practice_worksheets_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 5588 bytes
SHA-256: d17731a8e9de01164cb5a113794bc6fa47903f71da9111a0d5c61a0547152803
font_01_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 10596 bytes
SHA-256: 2dd5c90b2fc32ca86403203c6061ac711b2ed6447a9a6cd3d0c389f3c26e5c5d

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