Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfb008f11d8877…

MALICIOUS

PDF

85.7 KB Created: 2021-03-13 18:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e6f742766c4fb020433abef0e8675c2 SHA-1: 94014218910c3adf38d3c8d8ffdb7be7ff81accc SHA-256: 81bfb008f11d88778760086f0380e89ed82700ce2ce67c45bad1ce27efca58c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary suspicious URL being https://jottigo.ru/strik. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=does+cbt+cure+depression PDF link annotation
    • https://cdn.sqhk.co/xokebuzizo/iiEjigg/bluffton_university_baseball_roster_2020.pdfIn PDF document text
    • http://vehicleinsusa.com/167389335occhc.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/hyYggtk/nodixiravivesopatuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/hbijigK/arcade_belts_midnighter_slim_belt.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/gjyhhVL/help_steps_apk_indirme.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/VZGij0e/rail_rush_wiki.pdfIn PDF document text
    • http://naturfresh.space/1655728136peua7.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/wotodedaruzuk/2018_films_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff99de8-87e6-4757-91f4-55ccb0689e83/39643936722.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_00c02e8c26494702a5ceb58e9287d5dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ef3b62-2d31-4492-a848-c8e9d087ece4/graphic_designer_salary_los_angeles.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_f6b054266b6b49c887858853f3e74e3f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b524d0ef-b347-4ab6-b54b-95ed529a149f/difference_between_dna_and_rna_class_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412a2ec1-a2ea-4b27-a990-45fd8d564eec/what_can_you_write_off_as_business_expenses_as_an_independent_contractor.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/lotovesobadojototipe.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/iceman_english_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/cot_bed_sheets_aldi.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/74853905438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1549e813-fce3-430d-9f1e-7f2d88b3b51d/76632648437.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_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 4964 bytes
SHA-256: ad70fc1c50aeec4bc28602a147e26cc9a5ddea4f56f3d025b0caae7b0adbaadb
font_01_sfnt_off0001254b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 10576 bytes
SHA-256: 965699ba66b77379e110a7e091077e572028cce61e8641feeaf327de34a065d3

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