Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa40dd0bc940b8f…

MALICIOUS

PDF

68.5 KB Created: 2020-11-26 08:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e8f7a58367a20e731368a0766cb29606 SHA-1: b5ac56a8393d60ade640bfe4f6f8789449af8b9e SHA-256: 6fa40dd0bc940b8f05ff7d7f8c6469880298fbe5367ef2ade071e54e0647ab0a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's intent is to trick the user into installing a browser extension. The embedded URL `https://traffnew.ru/strik?utm_term=toolkit+for+fb+by+plugex+chrome+extension+download` directly supports this lure, likely serving as the download source for the malicious extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffnew.ru/strik?utm_term=toolkit+for+fb+by+plugex+chrome+extension+download PDF link annotation
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/delatel_jujugumufir_gubodivulewisen_gofet.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/1442772.pdfIn PDF document text
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/sutuwufawomul.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/sutusozupixapu.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/dalofa-kanezawarejosu-kasifawi.pdfIn PDF document text
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/gulafikajiduzutum.pdfIn PDF document text
    • https://kolerekum.weebly.com/uploads/1/3/4/3/134350376/lajomeka.pdfIn PDF document text
    • https://zomutelisofo.weebly.com/uploads/1/3/4/7/134712892/112646.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/nisiwanolom/78297878595.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/14735920520.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/61857877283.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/job_description_template_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b236b3-f6bf-45e9-97e1-f8bde002fb6c/kalikuzagimabuwebegep.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/cisco_ise_2._2_patch_9.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/can_i_return_baby_formula_to_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd6932c-f893-49e6-b85b-7472005975bc/55435662034.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_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 5984 bytes
SHA-256: 4fd2c930dcfd6c58c47b753c3435c47c957230c1f609db5dd45939b2c99f3f38
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10680 bytes
SHA-256: 655fb676a059823fc36e6ea30f313bfc6bb1bd31900fb6979cfd04bafe0197a6

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