Malicious PDF — malware analysis report

Static analysis result for SHA-256 0243c68316047b54…

MALICIOUS

PDF

76.5 KB Created: 2021-05-03 18:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8f890c04e4c1d4cd15c8c638e758ec7a SHA-1: 53c26f978563d7cf09c6e689566809ca630f1008 SHA-256: 0243c68316047b546569d478d74279af67ca21096dfa7705f8d5a2a01ad447f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged the file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=what+is+the+marketing+strategy+of+starbucks PDF link annotation
    • https://cdn.sqhk.co/xibetevoxaj/7EhicVg/land_rover_defender_old_model_price.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/274c34fe.pdfIn PDF document text
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/xizinidolo.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/phhdjem/danolalasikaginibuda.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jeNoagc/12463788372.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca63dfa-fb0b-448d-860d-be0b6412feb2/19027544589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bb5f0b-7d79-484d-9fea-ae680af19546/network_guide_to_networks_8th_edition_chapter_2_review_questions.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_e0c1ee97346e4fc596bf78b63bc5f965.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9252d744-43e7-408d-ac14-1e66457c4e6a/tikefararugenib.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_0508fceee5d94427881d833a4b0fdd52.pdf?index=trueIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_9839546daa1f4090bec3eb83249eeaa0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01cc8928-c493-4e59-8fa1-0285ac14ff84/asx_penny_stocks_to_watch_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2d68e2-6e9a-4716-82b2-7171c8b5aa05/jilibaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a18f70f-145b-4f9c-851c-4aa83bf2b2a9/fikusabogezini.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_18da60dfc98d46798827efcb97204f6d.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 5580 bytes
SHA-256: e88e93ebc233553bcb0137e06666de272ede9dca6a1d6653558d375cfbfe3a7c
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 11368 bytes
SHA-256: 4e27d14e9d164c10970e666b8da328f1af4c380bedb0b96e8034b4c6b7d8b4a0

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