Malicious PDF — malware analysis report

Static analysis result for SHA-256 685a133fc43d0374…

MALICIOUS

PDF

92.1 KB Created: 2021-01-22 22:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d4a26acb34e693cb334109b622ea8514 SHA-1: 0d5765266cdd06bbc448b42481b779cbea311d44 SHA-256: 685a133fc43d03740f242572462ac42e22ac29230a38e1787544cd05a377ecfe
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 of which point to other PDFs, indicating a link farm for SEO manipulation. One of the initial links leads to a URL that appears to be part of this scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=cisco+asa+5545-+x+datasheet PDF link annotation
    • https://site-1171472.mozfiles.com/files/1171472/share_photos_samsung_tv.pdfIn PDF document text
    • https://site-1179150.mozfiles.com/files/1179150/cartoon_network_plush_toys.pdfIn PDF document text
    • https://site-1194623.mozfiles.com/files/1194623/88196862346.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/7945132.pdfIn PDF document text
    • https://site-1084296.mozfiles.com/files/1084296/45333874209.pdfIn PDF document text
    • https://site-1173610.mozfiles.com/files/1173610/wilderness_survival_movies_on_hulu.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/eventide_pitchfactor_user_manual.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/tezupenodipemova.pdfIn PDF document text
    • https://site-1180773.mozfiles.com/files/1180773/vanoluzusepezilanidemidat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/kivunefaze.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/futoralewozavakugufegu.pdfIn PDF document text
    • http://xavisijividefo.epizy.com/silolatotoxemekasitivuxel.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/zotiretuwunawuretamadi.pdfIn PDF document text
    • http://jovuxajir.rf.gd/zusazajabazulonubaletin.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/nfl_schedule_week_3.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_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 5116 bytes
SHA-256: 8011d22a51b9d988ea716094f098882d013f900a05ca8bfebae5ff9ab65bfe64
font_01_sfnt_off00013a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 11980 bytes
SHA-256: 55cd72904537fe298933d1d357c277e6db6d811884af089a150916e84a337fbe

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