Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e9aa1d11929411…

MALICIOUS

PDF

86.1 KB Created: 2021-05-16 22:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 784badda6210cb0600b7a0b21cbf93d8 SHA-1: f4cbfd884ca83e4f82c95d0d5c0016b88971c077 SHA-256: 10e9aa1d119294112723b5812a3d38a1ddff76071dd16a34be6529a9c140a4ea
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=sectional+chart+airspace+altitudes+msl+or+agl PDF link annotation
    • http://zanartcc.net/pimoxisilapwwd7w.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/powerful_intercessory_prayer_requests.pdfIn PDF document text
    • http://expressday.online/titulo_de_credito_definicion_juridicaypril.pdfIn PDF document text
    • http://sqrab.top/latabelukebojoxuv8hko.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/character_traits_worksheets_for_grade_3.pdfIn PDF document text
    • http://shop-onlinediscount.xyz/gurotonobarefeboref6gxu.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/88157874745.pdfIn PDF document text
    • http://gerda-msk.ru/35128310201sj97i.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/jelug.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/ibps_clerk_2020_result.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/benesineki.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/vovabagubajegeb/71451350154.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_460aea1a50af4c4286d3d039af05755f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/volefalisemagofugukij.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/fixeruzojujokalowovovixu.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_e874112e3cf44dd3ad7491d24be75d50.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_22916fa75f65458c80465b4ff14e79b2.pdf?index=trueIn 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_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 5592 bytes
SHA-256: 5864368288592c9368693f8952e9adc76d1b16109e478856c25d07b7c087f9bd
font_01_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 10844 bytes
SHA-256: 03d43cb7027e95bf81d69dab04147902a26b79bd7f593fee22e7606b61c4a3ee

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