Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4ee42f526a3aea…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 03:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ff473e5bdc57d68959ede16b01974c SHA-1: 7131431e940efe34d826d6668cd46c38aeac164f SHA-256: 8f4ee42f526a3aeafbb75d378eaf89ef282e63456458b557971f183f737f0e66
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=atlas+netter+editia+5+pdf
    • http://kawlites.online/microsoft_office_free_powerpoint_presentation_templates41yel.pdf
    • http://trokot-online.xyz/jekekidapees2eg.pdf
    • https://gibinefofagal.weebly.com/uploads/1/3/4/6/134668975/bitatutavod_buronedogi.pdf
    • https://wilumixomili.weebly.com/uploads/1/3/1/4/131483065/2606841.pdf
    • http://koolmaxt.online/is_starbucks_giving_away_reusable_cupso3nw8.pdf
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/eb1e32fc6e6b.pdf
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/9145038.pdf
    • http://topstudy.fun/258342571495f364.pdf
    • https://gewujamagig.weebly.com/uploads/1/3/5/3/135339218/nedoxe.pdf
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/tonulebowe-xizibajesu.pdf
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/12af94d7361.pdf
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/5ef31c0f34134e.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/d6729c1.pdf
    • http://de-bewertung-889562.icu/973851684o5i5k.pdf
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/walisagif-bufekanow-xuwefep-liponazofijam.pdf
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/343121.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c3af2305-f4da-40fc-bbfe-a18e9c85399a/fiwavubu.pdf
    • https://uploads.strikinglycdn.com/files/05751013-1e9e-4172-a1fd-0dae73938955/how_do_you_make_iced_coffee_in_hamilton_beach_brewstation.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_068524ce4fce4ea8a7118df7dc68651b.pdf?index=true
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_b9620614f9fe46378fd2bf7e2756a1e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0db428c8-ec2e-448e-95c1-a65f649235da/how_to_scan_from_hp_4630_printer_to_computer.pdf
    • https://uploads.strikinglycdn.com/files/a15b17f3-90d5-4146-b583-64620e517fbc/why_did_batman_fake_his_death_in_the_dark_knight_returns.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dc.bin
85be653d85944e51f2a192241650ae872413cd2faabae369a32a8f409f5e10b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 5148 bytes
font_01_sfnt_off0000f772.bin
311f2b588fdd4cf08971adf58dde1856e6d0c5cc571082608f97049273a5c86a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 11276 bytes

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