Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acb1a75a081434f…

MALICIOUS

PDF

74.2 KB Created: 2020-12-25 12:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3388cc9b7e773f031ab9bf65f8dc4823 SHA-1: 7bdbb8d71b325b7a7a2dd281fd4cac5fe7ffa49b SHA-256: 0acb1a75a081434f92809b7e1123763939bb4287a9d969c11a10d10a5c9ac94a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it is designed to direct users to external websites. The primary malicious URL identified is 'https://trafficel.ru/123?utm_term=1976+dodge+motorhome+manual', which is presented as a search result for a specific manual. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafficel.ru/123?utm_term=1976+dodge+motorhome+manual
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd0d3dc1f8d9.pdf
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/turerakiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/633d2aff-160c-4381-bc8c-39856c7bb146/cricut_explore_air_manual.pdf
    • https://s3.amazonaws.com/vebogotexaf/2297085002.pdf
    • https://uploads.strikinglycdn.com/files/5ce914ca-78a0-4cee-ace3-2016f2f2496a/cd_key_cs_1._6.pdf
    • https://s3.amazonaws.com/tokafanawa/jantung_koroner.pdf
    • https://s3.amazonaws.com/tomamujuf/xakamog.pdf
    • https://uploads.strikinglycdn.com/files/b3feb2b7-cd13-4fb9-b133-329d3821098c/thousand_splendid_suns_book_download.pdf
    • https://uploads.strikinglycdn.com/files/de2542f2-bd84-4e61-8353-fea8caad2036/budofagozodesepamezale.pdf
    • https://s3.amazonaws.com/xalasawu/gakibadoka.pdf
    • https://uploads.strikinglycdn.com/files/242a710d-f1bf-4665-bd0d-8faaec6e6484/encyclopedia_free_download_for_pc_full_version.pdf
    • https://uploads.strikinglycdn.com/files/91ad0751-adda-4c3b-90fe-2b683a0b5860/conval_high_school_athletics.pdf
    • https://uploads.strikinglycdn.com/files/daa99183-7468-40c7-b850-226fe629fcb9/sn3_po4_4.pdf
    • https://s3.amazonaws.com/jupevuxirapi/rerimogonesetujon.pdf
    • https://uploads.strikinglycdn.com/files/e8026c63-785a-499e-9a28-a14368102d1c/jakafoxivurezaxoreb.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_off0000e461.bin
6f5e30b827a1471c73d13edbe66eaa852d1085ac4c1e38c7c8a799e47680642f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 5408 bytes
font_01_sfnt_off0000f69a.bin
6cbdf42b11e3cb54fea4279c5293397b57df915a5d16e2cb36ad838ae738f517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10964 bytes

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