Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6da83c04c6a93e8…

MALICIOUS

PDF

71.4 KB Created: 2020-12-25 06:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d2eb06be8b56b5ffc5d370a4a8c41a67 SHA-1: 92d46a1bbcf2e81e0cd3d2d67a497911311f9d7b SHA-256: f6da83c04c6a93e82f9d5b39a4b6ddfa8d1c5434cf0189545d73c28a585cd624
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm designed to obscure malicious intent. One of the primary URLs, 'https://trafffi.ru/123?utm_term=playbox+download+apk+android', indicates a lure for downloading an Android application, likely a malicious one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=playbox+download+apk+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469827/normal_5fc3f9d91ae52.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/9162049.pdfIn PDF document text
    • https://nusikunamapuger.weebly.com/uploads/1/3/0/8/130874430/c791f1fbb291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fe56272070bc.pdfIn PDF document text
    • https://fojivuwixi.weebly.com/uploads/1/3/4/8/134898156/9035861.pdfIn PDF document text
    • https://zonebudufekepok.weebly.com/uploads/1/3/4/3/134382159/vogojobilarowokele.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/ethg5ib/smash_cops_heat_apk_day.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/LgiY8hg/mimutetofipaf.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/8b14f725-6cfa-4551-8ebd-2c9bf0c2e9db/posutabalazeximuzuzaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26402585-40cd-41b4-953c-3660fe20ea8b/best_video_call_strangers_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106b0a2c-8609-4248-8d85-cff22b8d5ede/richard_wolff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba2e8d0-66f6-4ac0-beb1-d22e8e8eb41d/hidden_valley_oregon.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_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 5244 bytes
SHA-256: fe00ecb3110c53b0c622a23bc738bd385584e9dee5edc29eeda454dd74e6d57c
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10976 bytes
SHA-256: 01d6d4b6e487e01d70bc592a9546f8f998c52e5be0dfaa125aa60c4ba3230f77

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