Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82912c753bc9f1b…

MALICIOUS

PDF

72.1 KB Created: 2021-01-04 06:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 66ff936ca6ec1054de0b48dbe47f430e SHA-1: ea421c1a71ca88088713ded6a24579952b10eced SHA-256: f82912c753bc9f1b906b1aacc0c6f347579e36e3cf66959cf55743d8dfe81723
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://trafftec.ru/123?utm_term=full+belly+farm+monkton+vermont, is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution.

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://trafftec.ru/123?utm_term=full+belly+farm+monkton+vermont PDF link annotation
    • https://bubawupuga.weebly.com/uploads/1/3/4/3/134380130/fukopafuk.pdfIn PDF document text
    • https://mesaxejako.weebly.com/uploads/1/3/4/0/134097573/pixaxa.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/dcd4eaf0-2abb-4444-91d7-86be74d0e177/satanael_gun_build.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/bahubali_1st_part_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/awaken_the_giant_within_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gb_shaw_arms_and_the_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077bf234-4d8d-4555-a358-59424f7cb2c5/narwhals_narwhals_swimming_in_the_ocean_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcea643-3f48-4f53-b0d5-91f0ec580c04/words_starting_with_cage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b036da01-8671-4d8d-88fd-6938b4cb083d/43948324848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe08d30-7e15-4e15-8f75-fd8bef589bb9/94553254775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb99a06-6297-4466-b705-49fa50394026/64823436088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1b9fd1-6dff-46ce-80ea-0076817819b0/6709944710.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/cache_cleaner_super_cleaner_apk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 5056 bytes
SHA-256: 86b5e820fa53deee31d6f2a35e0f5240493df7897de7d4e34d45a8563f745439
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 10720 bytes
SHA-256: 26c72cddc7183b7e484b4d72da439884671c5deb8aae7a2bc2f1c4686790f7b0

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