Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f0abafed66f33e…

MALICIOUS

PDF

72.3 KB Created: 2021-06-01 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9a5474e0bdf774d591c881b6b4b2a087 SHA-1: b603ebcaaa170723a4c0a23bebf13b9d06e290c1 SHA-256: 40f0abafed66f33e1f80239b8518a82cd1073e3d27c2cdd1b1adf6bad1e67b30
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The embedded URLs and the heuristic findings strongly point towards a phishing or SEO manipulation attack pattern.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://huntic.ru/pbw?utm_term=how+to+beat+the+egg+drop+challenge PDF link annotation
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/garekif_tigomajek_lomeseko.pdfIn PDF document text
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/rafemewar.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/cfa2f740426c.pdfIn PDF document text
    • https://lufugidot.weebly.com/uploads/1/3/4/8/134848642/892693.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/fupeluloxubu-bofesosija.pdfIn PDF document text
    • https://jaluzirilunotu.weebly.com/uploads/1/3/2/6/132681851/biwepedijipamawomu.pdfIn PDF document text
    • https://pamumigupoxip.weebly.com/uploads/1/3/4/6/134614169/9318435.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/58bdff.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/xenigatadagirozaneg.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/fabegiwedo_pabilema_lapidiro.pdfIn PDF document text
    • https://foxizogifo.weebly.com/uploads/1/3/4/6/134627616/jajitokoxojiwipilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e4260b-89bd-4cc1-9a9b-a7ef7f313335/math_worksheet_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f89bd7-7d71-4bce-a592-66b4ef1ffcef/4th_grade_math_multiplying_fractions_and_whole_numbers_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3009a8-6611-4720-aa2b-933392b2bd7a/4972481234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c1387b-0038-43aa-bda0-11728a58ce97/zapapiz.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_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 5352 bytes
SHA-256: 6cec919e182f102c74ab5d7d7bbba8840d9cceb7b77581c378547abb47903290
font_01_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10336 bytes
SHA-256: 866ccfd616306357a51aeb7ceec9f4ebbfc8470cb47015eef840a7bb1ef0c8c0

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