Malicious PDF — malware analysis report

Static analysis result for SHA-256 677595491484c900…

MALICIOUS

PDF

85.9 KB Created: 2020-12-15 06:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973226ba8ea86c8772e7e8e7acb26e6e SHA-1: ee2229e73afff19cb36dcf4ab985c0ae241ea4bd SHA-256: 677595491484c900d89a65fd4a46fc0f847c1872dc2b212734756ad8e0bf6348
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicating a link farm designed to manipulate search engine results or distribute malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sti+shift+knob+thread
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/3758102.pdf
    • https://wivujawa.weebly.com/uploads/1/3/4/5/134582083/dolulafapipulabi.pdf
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/134175.pdf
    • https://niboxevukok.weebly.com/uploads/1/3/4/6/134649508/fojiguzo.pdf
    • https://vapojulugib.weebly.com/uploads/1/3/4/6/134669528/e952b27462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc4d05c403f5353fdaeb827/t/5fc960e397cced73bdbb718d/1607033061108/finding_bigfoot_monster_hunter_apk.pdf
    • https://s3.amazonaws.com/pukiza/20959550817.pdf
    • https://uploads.strikinglycdn.com/files/d42db89f-0e12-41db-b602-fc86130bc302/64899285117.pdf
    • https://s3.amazonaws.com/titugome/85813354730.pdf
    • https://uploads.strikinglycdn.com/files/793d2967-7ce4-4b20-a5b7-7b10ea07a31b/2258248433.pdf
    • https://uploads.strikinglycdn.com/files/b2143ee7-de5a-4b0f-b6a2-ddd607f07b0d/56601827222.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/hypertension_guidelines_2017.pdf
    • https://uploads.strikinglycdn.com/files/20ce20a0-dc19-44fe-b74f-f874d7dd9117/human_impact_on_the_florida_everglades.pdf
    • https://s3.amazonaws.com/juduk/rudivebo.pdf
    • https://s3.amazonaws.com/gezetega/tefowiberinijugitupub.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_off0001120e.bin
f7b78ceef1fc4625cc2c49363a128a04b1cf12f80fa0bf16da0c8579240a1612
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 5272 bytes
font_01_sfnt_off000123f0.bin
a9dc81a27f83c2bb1f73b656cfb450a3067c39af85f105dc7c6c2d24288542d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 11428 bytes