Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa65011d8d8bb4ea…

MALICIOUS

PDF

76.2 KB Created: 2021-02-04 19:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d6ece2c384e230c36e0bddbf2a7d1d97 SHA-1: 053ba4bcf1d249035b69266e48feaa69ffca5381 SHA-256: aa65011d8d8bb4eacb2bd1d65a3efc650f6ee0e90d9ba11cbd6f7f4b976cc515
134 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 phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute content via a network of potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=converter+pdf+to+jpg+high+resolution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff072d27174d.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/hhgihgg/remibaruwawudefadosijewif.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/6108a.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/dQjjhik/37167364670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_601566466e17f.pdfIn PDF document text
    • https://gawofatofuwe.weebly.com/uploads/1/3/1/3/131380275/vonifowo-takabojevet-nexezor-foregesoz.pdfIn PDF document text
    • https://penebiji.weebly.com/uploads/1/3/5/3/135346042/c24225.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/4WCovih/cute_dollify_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_601b9fef4857c.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/5365876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remavuj/91711025953.pdfIn PDF document text
    • http://labutebumir.rf.gd/chaganti_pravachanam.pdfIn PDF document text
    • http://zogivumomu.epizy.com/evaluate_the_algebraic_expression_worksheet.pdfIn PDF document text
    • http://binaraw.epizy.com/below_information_requested.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/hotpoint_aqualtis_washing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/vavuvefegepenegupedukalud.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/64930896248.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/setanewenulufimax.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5132 bytes
SHA-256: 4c152c5bd3482734b754ea019f20c52b35ab77d9b60cea3c481e36edc3570b83
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 10432 bytes
SHA-256: d93ef64a9a0af3e9b737bd31aab8f295ceb74542c4b459c1b5f69232c8faf662

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