Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da8d82796b91c71…

MALICIOUS

PDF

77.9 KB Created: 2021-04-12 09:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f43c4733761785fdf9506502ae732c2 SHA-1: 4b375a72ff621223e6a0a2a6abf75fc3b633ab78 SHA-256: 6da8d82796b91c71bf2b48befe7ea31f971876c4f734cd3b4c331e845414ace7
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The document contains numerous embedded URLs pointing to external PDF files, many hosted on disposable domains or potentially malicious infrastructure. The primary function appears to be directing users to these external resources, which could lead to phishing attempts or further malware downloads.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=navy+diversity+policy In PDF document text
    • https://cdn.sqhk.co/vesagivara/Djaihid/touchgrind_skate_2_mod_apk_iphone.pdfIn PDF document text
    • https://mixidesurujof.weebly.com/uploads/1/3/4/9/134902607/tedewujej-litawugalimuko.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/cx5iejd/71166058825.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/hhdBCfB/91498525197.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/Fa5jegd/highlight_text_in_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/ridekogimu/PLjjjbw/op_amp_integrator_circuit.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/cA3bghJ/75704978865.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/2269630.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/gjbgewB/69638841959.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/xokebore/samsung_ml-2165w_toner.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/zureledunawanigerifawal.pdfIn PDF document text
    • https://5d7339f9-c273-460b-87f2-4f5aebca05c5.filesusr.com/ugd/738632_84b3276f327242978425f90e314d3992.pdf?index=trueIn PDF document text
    • http://zabotafe.epizy.com/reaccion_alergica_a_picadura_de_abeja.pdfIn PDF document text
    • http://jabukejezari.epizy.com/91186108614.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/45171078341.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_5f1c52b4d6cc49189a59209d979127f0.pdf?index=trueIn PDF document text
    • http://dijawazuk.rf.gd/50808343718.pdfIn PDF document text
    • http://xesidif.epizy.com/cefr_english_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/zuselixasir.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_233a3f67e3a14f2d956984aac730c56c.pdf?index=trueIn PDF document text
    • http://rogofijanititad.epizy.com/funalulajejudiditasote.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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 5196 bytes
SHA-256: 94e972e14a0f1e5b9f36631fcabdf7c71284e61670d16c9b923f0f239245f5f2
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10716 bytes
SHA-256: 98c02743ec85bbb4e148a5f16fe989735112d25abdf0981f94410aee8f597db1