Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c9b957d17d6322…

MALICIOUS

PDF

104.5 KB Created: 2020-11-23 08:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ff8805c83c29bdfe32c1c227d2fd091 SHA-1: 0a4368b540dedf6c3b235d3c7e3d59d604b8658d SHA-256: d0c9b957d17d6322a80586b2028569fad3030a36dc7a31ed3d1de91b1991f51b
314 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector link, a link farm, and a lure for recovery secrets or passwords. The ML classifier also strongly flagged this PDF as malicious. These elements suggest the document is designed to trick users into visiting malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/aws?utm_term=azure+active+directory+authentication+library In PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/fuxazomita.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/xaxap_toborexed.pdfIn PDF document text
    • https://dimakevumegipex.weebly.com/uploads/1/3/4/3/134352849/f7b5b66bf8376.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/faboxu_benij_nudime.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/zatukotuderipi-dowawa-boxuxigenug-puniwajinur.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/xopowinubomokon-zozofefodijawuf-bimafajawevagu-pilavebenixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5fb4f32ab9d8e.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/tunenijexe/fivobep.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/fekezogiwobimorijaga.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/fapasitaja.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/staph_aureus_bacteremia_idsa_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/72266359910.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/giwexeti.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/48123021405.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_off00015b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B33 5192 bytes
SHA-256: 8ff4e008f703496fa8ef3877e10b297336b58ce34528b78ecd567c9f8c5d585c
font_01_sfnt_off00016cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEA 11628 bytes
SHA-256: d3e7e38a90ceae7a799b99109efd23dff307d136fc0d15b08ebd54c5fded9a96

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