Malicious PDF — malware analysis report

Static analysis result for SHA-256 948d6e5a60481eba…

MALICIOUS

PDF

82.9 KB Created: 2021-04-25 15:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf2d549a43e5f1db8e1b54e02f8ae51 SHA-1: d431c3c1755d0f49a08af6d69ca54415d79bbdb1 SHA-256: 948d6e5a60481eba3509effd32e278985f79fe1c4d41737a7ef1c1bb1a5c3a07
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which are SEO-related, suggesting an attempt to manipulate search results or redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the SEO spam or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=best+weber+charcoal+grill+accessories
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6011d6fae5a55.pdf
    • https://gafabudadu.weebly.com/uploads/1/3/1/3/131384489/6810894.pdf
    • https://cdn-cms.f-static.net/uploads/4454967/normal_6054bbcef1530.pdf
    • https://cdn-cms.f-static.net/uploads/4454290/normal_603e6aa6aaec3.pdf
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/navojudewukoja.pdf
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5ff906c1a530a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63a72076-cf14-47d0-9936-46a5fccceda6/white_fang_jack_london_sparknotes.pdf
    • https://s3.amazonaws.com/kisagoz/how_to_reset_airport_express_to_factory_settings.pdf
    • https://uploads.strikinglycdn.com/files/e0db41d9-9370-42cc-ae90-eb10028b32e8/potty_train_in_3_days_or_less.pdf
    • https://s3.amazonaws.com/mivokozibu/gixilibasisoze.pdf
    • https://s3.amazonaws.com/limepusotanal/hunchback_of_notre_dame_book_pages.pdf
    • https://s3.amazonaws.com/naxozelozude/97270943937.pdf
    • https://uploads.strikinglycdn.com/files/042ea5e3-8cb2-4a8c-9c8c-bff3521a2f52/siruvivugofidupiwagusa.pdf
    • https://uploads.strikinglycdn.com/files/d616d975-cb59-4851-9ce6-3ca64bee6e0f/xanokizavulizunot.pdf
    • https://s3.amazonaws.com/paxuvagal/22517806340.pdf
    • https://s3.amazonaws.com/rizezobabub/gufarikogi.pdf
    • https://s3.amazonaws.com/vedexajawo/navien_ncb_240_dip_switch_settings.pdf
    • https://uploads.strikinglycdn.com/files/cb7b099b-3ebe-4470-a951-763f695f2657/pereb.pdf
    • https://uploads.strikinglycdn.com/files/93e79459-297c-4bab-b1f9-d834adabddda/21166784022.pdf
    • https://uploads.strikinglycdn.com/files/7b24a815-4ca4-4713-a875-518991770ece/jilogomutuxawefi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057f.bin
50a81d45cabb05f50aec298c3807e0358114cfd71c489692ed7cf49aca1b538f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 5340 bytes
font_01_sfnt_off000117c0.bin
4451aa93ee3fd52497ae24702003f6d74e76958997db65aa0123634b3397316d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 11368 bytes

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