Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ba3409d33708b…

MALICIOUS

PDF

86.5 KB Created: 2021-03-17 18:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f85586d0f63e6a3f56772172f32a1796 SHA-1: d68e67dcf9e533d3e09780c03948baac392412c2 SHA-256: 751ba3409d33708b22a168ac14ba2eaff62414647a7ae1c15b69aaf2de82408e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, https://midufefew.ru/strik, is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://midufefew.ru/strik?utm_term=delta+miter+saw+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6030ea5fbf224.pdfIn PDF document text
    • https://jemeleromonojo.weebly.com/uploads/1/3/4/0/134041090/veloxawot_sejamib_sanavawinebak_piwapokuwe.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/933b50.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/31812528102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fdf9a8d12cea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fefbe846edcb.pdfIn PDF document text
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/dejusuxoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_602e99c579e1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/61649460111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c720e0-9483-4266-9a9c-79884291304f/2002_f250_7.3_transmission_fluid_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ddc9cf-3339-4020-a757-3a707bdcca6b/jakozuwevajibudita.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_fa779513aa5e4042b69210aefcfdac85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2373d72-9f5d-4658-8c3b-3a7d9510b4d3/pelumiborimufupubez.pdfIn PDF document text
    • http://pijosufun.myartsonline.com/45464983953.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/honda_3000_watt_generator_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425baeb3-6ed5-48dd-a357-9339d0f07f60/femegututara.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_c734057a69df4ed1a6641fd953967779.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/captivity_of_negativity.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/9014574495.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_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 5368 bytes
SHA-256: 548b61350431d5f74a39bddefbe90c0162e261a816e532f5ef69b3d84516fd53
font_01_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 11904 bytes
SHA-256: 8555bb2042e799b6ceefc470b4fb0f17b8a3b775bf244e10b3dc0dbc6f9e066f

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