Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f676575c10e99ff…

MALICIOUS

PDF

80.5 KB Created: 2021-01-22 03:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eead53972dea3152d76dbd30859d6298 SHA-1: 775e75a340c8619ea2255debdf09196f670f6c6b SHA-256: 1f676575c10e99ff699062fa22d3e5699327cb887d363189b90a6bd226865100
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to a study guide, suggesting a lure to trick users into clicking the malicious links. The presence of ClamAV detection and ML flagging further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/123?utm_term=gse+ss8h1+european+exploration+and+colonization+study+guide+answers
    • https://site-1179199.mozfiles.com/files/1179199/18525104241.pdf
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/welamejefetag.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/gidoxunikas.pdf
    • http://gulebamabixaku.22web.org/betking_app_for_iphone.pdf
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/4560702.pdf
    • https://tijanowu.weebly.com/uploads/1/3/0/7/130739502/8ff100f23425b86.pdf
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/1839241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rivazixexuguri/manual_burris_eliminator_3.pdf
    • https://s3.amazonaws.com/nademopor/knowledge_encyclopedia_human_body_free.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/dainik_jagran_epaper_patna.pdf
    • https://s3.amazonaws.com/zisulamisozoto/center-_radius_form_to_general_form.pdf
    • https://s3.amazonaws.com/nufidibodudulad/sapivavogadikarosemo.pdf
    • http://sonowodiguvab.epizy.com/arena_of_valor_taiwan_apk.pdf
    • http://wadatenut.rf.gd/27459074285.pdf
    • http://xupudajiwozov.epizy.com/59337864869.pdf
    • https://s3.amazonaws.com/wakuzidi/81545430741.pdf
    • http://wavusuwu.epizy.com/87415877270.pdf
    • https://s3.amazonaws.com/pavujiniz/carproof_vehicle_history_report.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010fd0.bin
5cde87bb4db25134fcf66d99594236430ad958db55e959a6a0f339abe675fc5b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FD0 21564 bytes
font_00_sfnt_off0000d818.bin
0d4596e962b2f68a673e73ed1af2633068dbaa0a6dbd262748d7b0ff6bc1ea5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 5924 bytes
font_01_sfnt_off0000ec6a.bin
56aa0178c5f675ba8c344042c20b7823fb2519be4e35fd4d5e1271db2479b8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 10276 bytes

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