Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d4731afba8dadd…

MALICIOUS

PDF

73.0 KB Created: 2021-01-11 23:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cdef63047fd8b8e406fe0b55cc2c9351 SHA-1: b66618c614712eea1a09fcce736cb47e40e3ca47 SHA-256: c1d4731afba8daddbd90d6bd6352ea293697a0351da0a7820ed05dd385aab809
234 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document content is designed to trick users into calling a number in a billing or security context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/aws?utm_term=remove+kohls+late+payment+credit+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5fb77c8ff0e67.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/618130.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/4619620.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/gixunajegelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f99c678a3b0b.pdfIn PDF document text
    • https://site-1204089.mozfiles.com/files/1204089/does_norman_die_in_the_promised_neverland_show.pdfIn PDF document text
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/vuketakumapinodadid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_5fd73a33458c5.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/sakoxikedajodo-zezupejezi.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/tigovatolis/runokosowoluxuxujasikepe.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/chat_app_between_iphone_and_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/17869828445.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/luzunoji.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/79469698735.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/mimerebo.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5548 bytes
SHA-256: 97d9af7733371af0b4609ed29d5c0c8bee5f015e5e442bcda1b4bf7d9efa51fc
font_01_sfnt_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 10948 bytes
SHA-256: 60c28058cd94835c23e9daa2084362697e402aa73ec1f9187093f9ce6ee0193b

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