Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87678c22ed1ee5e…

MALICIOUS

PDF

88.9 KB Created: 2021-02-11 22:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3bcee7bb47b20debbe2d1ba988f3fda0 SHA-1: d20c6faf1a666580efd1682302c3586a5b32807b SHA-256: f87678c22ed1ee5e4366f81189b69d17cb702f797e6687c9fb5753597bd6dc6c
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely for 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://baarspo.ru/123?utm_term=bob+sport+utility+duallie+stroller+orange PDF link annotation
    • http://mangalvpodarok.ru/guxobuwulof4n48w.pdfIn PDF document text
    • http://ovca.space/fundamentals_of_ceramics_solution_manualp37vt.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/f3d804d3ede.pdfIn PDF document text
    • http://onlineeshop24.xyz/10845025788h7313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fce92fc7d262.pdfIn PDF document text
    • http://visiblawty.com/831120719633aqck.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/3656786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486363/normal_5ffdc4bf6955e.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/jegalefabovo-wisedisitu-tovozefukukiri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomigipasa.epizy.com/aeroplane_game_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/rajabiporofam.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/7227126334.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/informal_letter_writing_samples_for_class_6.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/lazoju.pdfIn PDF document text
    • http://nozaleb.rf.gd/78528754925.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 5416 bytes
SHA-256: f33952aa74607356646f21f174ec7b898a2596854d9382cd3803378b6cfc48c7
font_01_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 11284 bytes
SHA-256: e6e5cc2174a12615f9e7615a1d8382f26e8a66ecd81249bbb4efa677ce8a3581
font_02_sfnt_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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