Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c22a5ad6aaa3570…

MALICIOUS

PDF

84.7 KB Created: 2021-02-22 03:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2c1491f31f07f579e398bec7819a08d5 SHA-1: b5f51e6ee5177ca5719437865fd1495dc10ca24f SHA-256: 0c22a5ad6aaa35702f581f2e9c637fca80fc708ad7b526f4379d96d569b5b2e7
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains or known redirector infrastructure. The heuristic firings indicate it's a malicious redirector and a link farm, likely designed to direct users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack pattern involves luring users through embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=hp+p1606dn+printer+toner In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_602b73e215077.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/iibhh4f/dewukikajarajapebakonazix.pdfIn PDF document text
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/47006c26.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/7025594.pdfIn PDF document text
    • https://cdn.sqhk.co/gunobawiwax/hcyzBic/tubusunepiw.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/h3rjdFU/bendy_mod_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/egiAibw/29660325427.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/8c5b836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fe26e6618ff2.pdfIn PDF document text
    • https://pumejikugo.weebly.com/uploads/1/3/0/9/130969330/firuzizusizonixog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449984/normal_5ff8c50f69e4e.pdfIn PDF document text
    • https://cdn.sqhk.co/razonavari/eMibvlW/18885424607.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/4162564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_602d71e380fe8.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/hbihLjg/22450194619.pdfIn PDF document text
    • https://cdn.sqhk.co/loxinesupiva/f5hgFkW/exoplanets_discovered_in_the_last_5_years.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_6000ed1778fc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 4844 bytes
SHA-256: 234b9aa62127b38abcf2770d5d7e17da56413f3b2ef7ba1aafa8eb42b1531307
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 11224 bytes
SHA-256: eb3d5fac23862205f261c3273e3908daaf07ebbd4e4839694704e229934a7a10
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf