Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1916d4d18a8e9f3…

MALICIOUS

PDF

68.5 KB Created: 2020-11-20 23:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e7a4e2968c36d72d551abfcf8348bcd SHA-1: 1c16fdee0d983fc7d47f26a7d4435a1ab7369074 SHA-256: d1916d4d18a8e9f3101d95da194450e9b1fddfc941d536040746cfb94517b9de
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a URL farm and an embedded URI pointing to 'trafffi.ru', suggesting a phishing or scam lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number in a deceptive context, further supporting a phishing or scam attack pattern. No scripts were extracted, but the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/aws?utm_term=aadhar+card++by+name+without+otp
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/doxolaxisiwodad-zarusoz.pdf
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fabe086a6efa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sepawi/watch_golmaal_4_full_movie_online_free.pdf
    • https://s3.amazonaws.com/zufojadibi/17811424995.pdf
    • https://uploads.strikinglycdn.com/files/d1b198f8-e4c0-4fd9-af79-e3ee0c3925e7/15787948561.pdf
    • https://uploads.strikinglycdn.com/files/e79c50b4-7630-4ac9-afb0-d008df187dc7/2006_bmw_5_series_service_manual.pdf
    • https://s3.amazonaws.com/zategafozasiru/xolujixogovipinad.pdf
    • https://s3.amazonaws.com/dobesogum/slimming_world_free_branded_foods.pdf
    • https://s3.amazonaws.com/baxunaf/45693255633.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d093.bin
de26e494ace34c9dad281048de2c4b74cd42b74d598c3882aa03fd810c4bdd20
pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 5428 bytes
font_01_sfnt_off0000e2ef.bin
073e428faee6266f9182a9abea561dfbd0b210fd8fda22a424f2b1a46b32b9f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 9996 bytes