Malicious PDF — malware analysis report

Static analysis result for SHA-256 c064ab3fb76e2991…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 01:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28d4b92abdc127694a6c02ab8ff9d9e6 SHA-1: 522046a0b72c1a4a55d2de24ed5c343ae3b9ee44 SHA-256: c064ab3fb76e29915e2bfb7f67f0bca1927c6944a163a1e9e9139add2b27a0e4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=basic+sql+queries+interview+questions+pdf
    • http://kyhni.site/milwaukee_road_beer_linesj5lm.pdf
    • https://cdn.sqhk.co/rogenujudita/hhYGja0/temple_run_oz_2013.pdf
    • http://yoga-italy.space/jevunurugingmek.pdf
    • https://cdn.sqhk.co/vipikunowi/jbtpdjb/6725456314.pdf
    • http://parrrtner.xyz/armstrong_air_oil_furnace_troubleshootingb51w8.pdf
    • https://cdn.sqhk.co/rezeribevi/hajfhho/clock_calculator_bulb_puzzle.pdf
    • http://kawolamekepe.22web.org/microsoft_project_2013_for_dummies_download.pdf
    • https://cdn.sqhk.co/puxedimuwo/jcgjclM/17853481550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://leveroratex.rf.gd/automobile_engine_parts.pdf
    • http://mupufuten.epizy.com/41280782003.pdf
    • https://uploads.strikinglycdn.com/files/e100d94e-49de-4f1b-9585-05574fc5e7e5/90304747389.pdf
    • https://uploads.strikinglycdn.com/files/9adebcf3-ddff-40cd-9adf-5f9adf112d56/tenarironozugaz.pdf
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_44cc03c3d5ea41e1a9a3fe76acce66d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7380e9b-2c83-4b8a-a331-ab33c163cbfa/26142525742.pdf
    • http://nivemegasewokem.rf.gd/wrong_turn_3_video.pdf
    • https://uploads.strikinglycdn.com/files/7053ba90-8b49-40d5-a9ae-8a9efba82024/81064906301.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_618b11bb4c7b4f6ca839e57089efa465.pdf?index=true
    • http://godutiliwaganos.rf.gd/93035963330.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a55.bin
b1ffa8fae26d79945fcc464d16e5eb51e3c024e9528bd00c7969efce9db7986e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 5360 bytes
font_01_sfnt_off00011ca8.bin
404f132d339ef817530d85cf07074593d4fdddf2b788a1d8ceddbeef0a993819		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 11260 bytes
font_02_sfnt_off000142b7.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B7 4324 bytes

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