Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb655e5672665d3…

MALICIOUS

PDF

74.8 KB Created: 2020-12-01 21:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41d1065b057b89e6109fc6b94ac19ca8 SHA-1: 152a08923ea67f3e3d1d59b52f5b362d7c6be584 SHA-256: fbb655e5672665d33d2b2bd391a7c746669e4cafee642eb9e30b2f11d83836de
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/123?utm_term=survival+of+the+sickest+saliva
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f9e746103b54.pdf
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/1867531.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdf
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/6211250.pdf
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fc569122a8b8.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/2dd669e8342.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bokelur/rasafa.pdf
    • https://uploads.strikinglycdn.com/files/60ef1c14-fcb9-420f-8274-6e63b466ac04/lejotagizujemire.pdf
    • https://uploads.strikinglycdn.com/files/74087c16-af29-437b-8522-8da470b2a709/47864338269.pdf
    • https://s3.amazonaws.com/texifaxepag/mappy_ffxi_newest_version.pdf
    • https://s3.amazonaws.com/toguvaju/31931248933.pdf
    • https://s3.amazonaws.com/vebogotexaf/75335104110.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51d.bin
1f6aa61d8b27b6430bfd629a02b6c6d91422e9f8e636bbf3d8c5ae717faca57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 6736 bytes
font_01_sfnt_off0000dc14.bin
b74fecabc852f5459642f1793fa8fb5c9b5eba144545cb2a5d85e256c4e49321		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 4972 bytes
font_02_sfnt_off0000ed10.bin
da6d0f3e637e4e8579b9db92e214b208fcfdf2a99144ecf2686027ef66e19203		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 10412 bytes
font_03_sfnt_off0001103c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 4324 bytes

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