Malicious PDF — malware analysis report

Static analysis result for SHA-256 f422e0e42ac5c2fc…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 08:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: fd42cef712fe0aeff84784a9977557e1 SHA-1: 43d40d4aeecb33cceeb14c3b44821d99bfdca4e1 SHA-256: f422e0e42ac5c2fcfb93cbed92bed2805f9a6f957816186ecf1cfe2e9758d33d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

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://soxebez.ru/wix?keyword=world+history+study+guide+quizlet PDF link annotation
    • http://dazenad.iblogger.org/how_long_for_st_augustine_to_spread.pdfIn PDF document text
    • https://nusuvonofa.weebly.com/uploads/1/3/1/8/131872273/jirapidifu.pdfIn PDF document text
    • http://tuimag.ru/93851773045heuy3.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/e039b6.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/pigejamamalov.pdfIn PDF document text
    • https://rugilebeme.weebly.com/uploads/1/3/1/3/131380811/953ad.pdfIn PDF document text
    • http://igme.site/2003_ford_focus_svt_head_gasket_replacement1c5lc.pdfIn PDF document text
    • http://negeduji.66ghz.com/formule_molculaire_bicarbonate_de_soude.pdfIn PDF document text
    • https://molipexizeji.weebly.com/uploads/1/3/4/6/134693273/da7b7d.pdfIn PDF document text
    • http://hamsterbig.com/how_do_you_prove_you_are_judgement_proofhiubp.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/rodutiga.pdfIn PDF document text
    • http://goossyy.online/lds_general_conference_october_2020_afternoon_sessiongjj68.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/fekivijazodikilof8m13.pdfIn PDF document text
    • http://guginegafofa.iblogger.org/makugurajo.pdfIn PDF document text
    • https://nudatisuwirok.weebly.com/uploads/1/3/1/3/131384101/siporivab-wabapaguzeboga.pdfIn PDF document text
    • http://konanozopesan.22web.org/46068706247.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/6e9905c4-1d7e-4b1e-88ed-7e9b4b4005ca/google_my_maps_app_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c593f3d-a5a2-4743-b671-a317ec166bcc/36593523563.pdfIn PDF document text
    • http://jipegutakaxe.rf.gd/17114586766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f50e33-4d41-4e33-8480-d3be1f46084b/xojutuwakopipogof.pdfIn PDF document text
    • http://vevojadiren.epizy.com/2019_nfl_fantasy_football_draft_guide.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_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 5168 bytes
SHA-256: b685632f2e46ea3eef24c18b2c4f7c60a81dea69fa4ff4be0ec0ca02083c5869
font_01_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 10796 bytes
SHA-256: 4096bd1c8a61c5bd44dc590702f22bccfc9dbac81d306e579a61b37253fe4026