Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe805ad44f55244…

MALICIOUS

PDF

69.6 KB Created: 2021-06-05 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b92cf7d187a8c1cb295931b94a7c501 SHA-1: 21685eb859c6b01dcb474f86f0e2d34258f328c8 SHA-256: 9fe805ad44f55244a6a6266448e51fd592281d92794dc79d30c3765adfc1d1cd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, which is characteristic of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to phishing or malware-hosting sites.

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
  • 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://inwebjor.ru/pbw?utm_term=element+tv+display+settings PDF link annotation
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/6433811.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/zikapumiber.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/3976a02e5a.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/e2a910cd83f64f.pdfIn PDF document text
    • https://rebusisi.weebly.com/uploads/1/3/4/0/134017700/dad95f5be30000.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/060ee49aafc31.pdfIn PDF document text
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/divok.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/xajol-godofiwoz-wiredu-dasapir.pdfIn PDF document text
    • https://sejoxamopizava.weebly.com/uploads/1/3/1/8/131858661/40e972.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/6570229.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/galusekifurakutori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e915a96-8f75-40d8-9c2a-0b8955789500/autocad_electrical_2017_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea8d60f-b3df-45c6-b3d3-e3c3cf8110eb/56868235088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626b2d67-6d52-4aaf-86b8-58829c6561ca/5534608631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa6b75d-35c8-43f7-a30b-7cff16a97f6f/tragedy_of_commons_examples_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3cbc342-0f0d-4246-9331-0b5861c72001/bujip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3133dba-7d50-443d-a0ab-5ae8d9741946/lepugewababapinufeg.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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 5300 bytes
SHA-256: 8cd03bdcc1fe3b0c4fbfbe4bf8c406c06ca4a2beaaf61cc1e991fec9c5cb21ba
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 10252 bytes
SHA-256: 4e02cc81abaf7df15a2ad2d86e5140073d9cee80411f15b1534a9ec98ca9b310