Malicious PDF — malware analysis report

Static analysis result for SHA-256 486090a4f5f4012d…

MALICIOUS

PDF

90.2 KB Created: 2021-04-20 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d7c1f4ac8670de288c35768f5a37cdd4 SHA-1: a140b71bcb5763125cfbbe10d72a1534874c75e6 SHA-256: 486090a4f5f4012d8b646b9198a57190440b8557f04f9a5fd2b5ba3ba1c345b4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=the+secret+life+of+the+american+teenager+cast+john PDF link annotation
    • http://dhl-order.info/how_to_write_covered_call_optionsphqfh.pdfIn PDF document text
    • http://good-production20.site/snake_coloring_pictures_for_preschoolersfk0iz.pdfIn PDF document text
    • https://panejukirid.weebly.com/uploads/1/3/1/6/131606092/xivezaj-kemikajuzeka-nomavawelat-pikuwefipowotuz.pdfIn PDF document text
    • https://budovabi.weebly.com/uploads/1/3/4/5/134510119/fopixe_giviwe.pdfIn PDF document text
    • https://mixufatinir.weebly.com/uploads/1/3/0/7/130739404/467312cbfefc71.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/rupibokena.pdfIn PDF document text
    • http://trudogoliya.online/how_long_does_ccrn_certification_lastuw5q8.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/forome_giwaz.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/gelir.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/gejokizovere_gutuwin.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/7446830.pdfIn PDF document text
    • http://onlinekartiadesi.com/bike_race_mod_apk_apkpureg2mo0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/89224088467.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/fejenuzofaboji.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_0f41b807e5814257a619db9f913ae61b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/57302098269.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/curtain_call_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c549cdc-5fd3-442a-8255-eb64ee866d74/5_interrogation_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d4dcff-1f47-4988-9130-ea9b18017e84/7_healthy_habits_posters.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_beca5a7bff234685bbdcf152ed6678e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea6eac5-b82e-4efc-855c-7e9c63fa1c1a/kexegugefesobavaxuguda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 5108 bytes
SHA-256: 4866dafe33716771955187836342609cc88d313fc4e6c44e679389e6361a9b36
font_01_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 11560 bytes
SHA-256: 801a7f25a6eb6e4e3b95e630c17ec3b48922877f4e0ab037d6533535a2d2a8f7
font_02_sfnt_off00014c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C69 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c