Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca1bcb44a3332e…

MALICIOUS

PDF

74.0 KB Created: 2021-03-08 16:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8f15efa18933e26bdd9280c3e53fc65 SHA-1: 2ccf94ad1386b95b79300b5bc729e3cdcc4f3ef5 SHA-256: cbca1bcb44a3332e7a61bd27c9b47dbfef732c7ce63eba560d64179384d699be
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an intent to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=ponniyin+selvan+mani+ratnam+casting PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/ghFWaqG/ultimate_lightning_mcqueen_ckn_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/bha2qzI/drought_problems_in_africa.pdfIn PDF document text
    • http://espacecmb.xyz/bodmas_in_hinditzciq.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/1jgjhjh/81221872406.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/iGjjsie/vuvuk.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gghj01l/26768949897.pdfIn PDF document text
    • http://es50off.pro/85213546706ic7zl.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/4hgDYjg/72672883999.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/RFhegh8/80286787529.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/eos_rebel_xt_specszouxz.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/7744847.pdfIn PDF document text
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/givuxijuluke.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/2icjijd/29807603613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fukezavazuj/jobuzaliwijotarigebekig.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/68747645754.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/83351781951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9042d75d-de7b-4556-8ff5-c61b0e49323e/how_would_you_describe_an_organizational_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe6822b-0be6-4ca9-ba65-b2f67f20a714/22919381033.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/kg_cardboard_sheet_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3471c7fb-9b6b-453b-b911-a95c10a8c7f6/sulimuloresawuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005a8ac4-b01e-4a4f-abf6-cc11db51de9f/5_dysfunctions_of_a_team_chapter_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 5068 bytes
SHA-256: be0003dc3204ac8d42151cda7e878079bf888973e3b65f8f9b4a27c2d304d9bc
font_01_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 10240 bytes
SHA-256: fa875be4fe9909f0f40354523103291ae79e94dae6b2a64ed7acc3e1db244994
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230