Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa1f921edb5d239…

MALICIOUS

PDF

79.9 KB Created: 2021-03-11 08:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa0dcda3344273df2bbfd732ae15af1d SHA-1: 5422a6a1798c4440808bb55f4d413176c427958e SHA-256: 9aa1f921edb5d239a66308ec920cdc64c11341ec6956357ed970c638856d5674
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were directly extracted, the PDF structure and external URI firings point towards a phishing or SEO manipulation tactic, potentially leading to further malicious content.

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://maypoin.ru/award?keyword=optimise+pdf+mac
    • http://boevoenlp.com/listen_to_the_book_of_enoch_online_free4zuus.pdf
    • http://wozilimesiz.mypressonline.com/is_there_a_part_2_to_snow_white_and_the_huntsman.pdf
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fcf16007675d.pdf
    • http://rimka.xyz/crossfit_workout_chart1ts2d.pdf
    • https://cdn-cms.f-static.net/uploads/4490523/normal_60219d3c82780.pdf
    • http://barajofa.mywebcommunity.org/20763493009.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7a5c7c1f-79e0-48e4-aadb-86604eab3755/jakewedafujasororum.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_163ace1f69834131b503796a637d6192.pdf?index=true
    • https://uploads.strikinglycdn.com/files/056f93fb-05db-427d-92d6-90f8f31d56a0/xowadomijom.pdf
    • https://uploads.strikinglycdn.com/files/59a649c0-d21c-4fda-8a3e-bda2be6dd5d8/xirates.pdf
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_afd2a377df6e45db9e509afa44c83f90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82a47479-38c6-4aec-b953-60971cc72d0c/vupekawonobosavinom.pdf
    • https://uploads.strikinglycdn.com/files/5a1e625b-7c18-453b-a24d-ab6d977815c8/garmin_vivofit_4.pdf
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_3d8579db62234fb7be318ff018710801.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e030922-9592-4338-8001-872c41991dbc/basic_mathematics_formula_download.pdf
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_ebe92c3f44674ff4bf455ac4e3527514.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7ff0698d-d798-4db8-9947-19b7c7db994e/70120075902.pdf
    • https://uploads.strikinglycdn.com/files/d40cd918-1b5a-4070-b66c-e4f7d5008fee/99436176325.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_06f106009de64438919e278b96fe12e4.pdf?index=true
    • 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_off0000fa37.bin
1ff3a0b7896f691ac6e484323843db50daba07f6aee4193dabef91022d7f2895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 5200 bytes
font_01_sfnt_off00010bd6.bin
310bb23a39a6a8f0e1151364e811e9ec2ac07ee87bc7d256a854f6716927a4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 10944 bytes

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