Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5abd140816cc82…

MALICIOUS

PDF

63.8 KB Created: 2020-11-25 07:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a6044d32cef62750e0e377497f583505 SHA-1: 491ceabd581e5909417944f58c04e98aab80e7a3 SHA-256: bb5abd140816cc82afbe412e4c410c505a3f5d53f30a2da6cd67bd01b8353dab
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical finding for brand-impersonation credential phishing (American Express) and a link farm. The presence of embedded URLs and the ML classifier output strongly suggest an attempt to redirect users to malicious sites for credential harvesting. The file's structure and the nature of the heuristics indicate it's likely a spearphishing attachment designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rofinodaki.weebly.com/uploads/1/3/4/7/134721453/48b13.pdf.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafftec.ru/strik?utm_term=d%2526d+5e+chosen+of+mystra PDF link annotation
    • https://rofinodaki.weebly.com/uploads/1/3/4/7/134721453/48b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f893cfeee564.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/baxegezivumi/96357343457.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bridgewater_associates_economic_principles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65a3d1b-3468-45f2-929e-655faec96f4b/installation_electrique_domestique_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575dca21-b036-483e-b546-23d4c5686208/xariwosuzigasezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b0d238-3547-4f42-acb5-aebc691107ca/49559525487.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/best_photo_editor_app_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ac23cc-edc7-4e7a-ae19-ab6ba3f7596d/daxuvosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28b3595-186a-484b-a8ac-c1dd86665d90/the_boy_and_the_apple_tree.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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 4156 bytes
SHA-256: bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082
font_01_sfnt_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 10384 bytes
SHA-256: c7b937fb5f5935deabeab0e158d4e60a9289802a85107485ed92307943ee099e

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