Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a39ee58528bcdd…

MALICIOUS

PDF

73.1 KB Created: 2021-05-08 00:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 390448828fb51e902d4ebb1cf882d252 SHA-1: cae9fd14aecc1dda0150c8e70158362f3d05ac64 SHA-256: b1a39ee58528bcdd5f181a6f5128a77c6407e484aac0b187669d2883eb0746c9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The document contains a large number of embedded URLs, many of which point to potentially malicious or unknown infrastructure, designed to lead users to external sites. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=maytag+maxima+xl+washer+manual In PDF document text
    • http://mikovil.mywebcommunity.org/sanujesizomu.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/ShcibMv/rovofuw.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/fgfhjhb/taxiluvulojatevi.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/kazamafuvoligosajep.pdfIn PDF document text
    • https://cdn.sqhk.co/genedofe/jaidxic/kedekufatetaburonax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/file_manager_hd_3._5._0_apk.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_c43b1401b6744d56850751680b8a60bf.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_384b46357e384ceca8a68ceb63550df6.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_c0b52ebc77834664bd07d745f989e51c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/11544100186.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_1868b26ac58345f5b732dd6c4f5ca6be.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_f3920fccad4f4755bb5193c523178da3.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_d54c7922e4dc4fa785aeebfeae25468b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/zurerawubufowatop.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/steam_speed_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e7224c-73b7-4203-bd97-1453f20ca8ef/vebinoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d86953-e551-423f-8742-288f375c551a/suzezis.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/jiromixetawes.pdfIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_a7d86caa95854c369c1e3f2dca896c84.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d7001c59bd03417d8369592836ffb9fa.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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 5368 bytes
SHA-256: 3eef2281f7b6ce6c3f182feaa3d00eda2d5e959035fdfa0fe9773653ac529ab8
font_01_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 11212 bytes
SHA-256: cd49691cdabf176289424898c21ff1fc7c542fbbd5d947f561f924be5d95d334

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