Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc98b83432260066…

MALICIOUS

PDF

74.6 KB Created: 2021-02-02 01:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 189bc3c9295e16aab0d5cf4333091a95 SHA-1: 4a84c9af941bdda82bf6f5ec85df5f9ee4e7a4db SHA-256: fc98b8343226006638823e5166899e2ef4df3ea7eca2b2ac407fe68f732cba69
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards a link farm designed to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/123?utm_term=potato+aimer+destiny+2 PDF link annotation
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/jibetexusowaseba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_600da33888cb2.pdfIn PDF document text
    • https://matigolexa.weebly.com/uploads/1/3/2/6/132682665/zekuforuluvabuvetib.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/ajdjfgf/car_road_cross_rescue_mission.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/jfhel93/47245977664.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/GieDVGA/ruterisige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd0e5a611f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/qiblBXl/paroxirowakigatativ.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ZjiEDib/busibigixisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fe0de6a52f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fdc8367cae7a.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/jfjgD3g/sivuxikenijidixotezew.pdfIn PDF document text
    • https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/xamijigapebux.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/fjf9EhR/wild_west_escape_room_hints.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/dokomakaxupupa.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/hgj14ig/xigurazij.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/xibolikot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_600e49f21156f.pdfIn PDF document text
    • https://cdn.sqhk.co/pawanipol/hbjbjjR/97503642749.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/fghMPif/3244591197.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 3176 bytes
SHA-256: 1463d2e23dc884f91f84b9bb096b415250c9cc84c06ec0ef99172292261f30f9
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 5172 bytes
SHA-256: 1cb9c459ea56717f421430fe22351c62a59b1d83d459bd0f57bdd3f986b7e884
font_02_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 12692 bytes
SHA-256: 682dddc5befe171af9a81af03e0d3bcce236c1c700acd5feacdab8bedc13f6b2

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