Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6db41a8c4400dbb…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 23:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8f6bb58c232fbf4ed2c518ae7f9b3c5d SHA-1: 1abe8cf60b6c23102855df0ab194de8c391f624c SHA-256: d6db41a8c4400dbb51e476ddf057e500a942edd786eaef16407d895aa59d59e0
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://dugedepap.ru/strik?utm_term=why+is+my+brother+hl+2280dw+offline PDF link annotation
    • http://biomanua.website/64260988374k0bh.pdfIn PDF document text
    • https://cdn.sqhk.co/penomufepuk/jBheA3m/barber_shops_near_me_that_s_open.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/9785921.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/fIicBnx/zevurebigamireriro.pdfIn PDF document text
    • https://dedidebu.weebly.com/uploads/1/3/2/7/132740692/xoxamiri.pdfIn PDF document text
    • https://tokubarip.weebly.com/uploads/1/3/1/3/131380438/23e87b439ceb0d9.pdfIn PDF document text
    • http://asia.kiwi/66315428969yyzn7.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/Hrgggg3/rebel_cops_code_locked_door.pdfIn PDF document text
    • http://whalesqpa.fun/korean_basic_grammar_rulesg8k3p.pdfIn PDF document text
    • https://cdn.sqhk.co/raxulaxesob/jgheM4x/wowuvevilisotemikafalof.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/cJYtzhg/best_3d_archery_targets.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/xutudataxogomopmnf7a.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/jjBhbgc/9246824432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/52561819206.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_9ea77d4a0aeb41bfae29e3a6cc8b8174.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_b044844b77144323a3be8392f665bde9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/98338177912.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_047f5180af1d49a1bc37642dcaee0485.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujesulad/how_to_enable_scan_to_computer_on_dell.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5752 bytes
SHA-256: 181a84087d4b6a507c87bf92ccb3b47bb2de39af0618971cdd7d7af6f846a3cd
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 10488 bytes
SHA-256: f9790dc0382e77fa2a1b1437481930cab9d90918e307e42683a20123db6a1144

Open this report in the interactive analyzer, or submit your own file for analysis.