Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e919d3715a75242…

MALICIOUS

PDF

74.5 KB Created: 2021-03-26 07:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82b1837645f19d5b8af18c75eecf042b SHA-1: 5065c873d9cad6b844dc997e0b0c84cf1daaacb3 SHA-256: 4e919d3715a75242ab364b8a4f73d7a8d306858519162ce9ac752d7d8fdeb4c0
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to potentially malicious domains. One such URL is 'http://supermagazforsale1.xyz/50078627668dqj5g.pdf', and another is 'https://zajinet.ru/strik?utm_term=city+of+seattle+mechanical+engineering+jobs'. ClamAV also detected this file as 'Pdf.Phishing.Trojan', indicating a phishing or malicious intent. No scripts were extracted, but the structure suggests an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/strik?utm_term=city+of+seattle+mechanical+engineering+jobs
    • http://supermagazforsale1.xyz/50078627668dqj5g.pdf
    • http://byseles.xyz/how_do_i_change_the_wifi_on_my_geeni_cameray5geu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_192d5292042448649f9ab2da5297dd60.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_fbd78d8ad84a491893ee1581759cdb16.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_046ae5a65e964efe871b5279e1b0b26b.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/9656633081.pdf
    • https://uploads.strikinglycdn.com/files/bea2afb6-6205-451b-8364-008495ba540c/55002556915.pdf
    • http://litopuputorer.rf.gd/sikadoxikiravitizukuled.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_9483b3103fe64277aa8eaf5960f13624.pdf?index=true
    • https://s3.amazonaws.com/bubeto/adjective_phrase_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/25216fb0-ae92-4a98-a612-8251022e2580/jazoreresobazup.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_cccb1a6aab484104a40d2ad41f18b727.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5fc29d35-42fc-48bd-ba69-e1d0452453cc/75366054149.pdf
    • http://pususarejopo.epizy.com/allahabad_high_court_aro_marks.pdf
    • https://s3.amazonaws.com/fekife/diono_radian_rxt_crash_test_ratings.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3a82f5a60d6042e9b5e985e2bf3a67d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47debf14-2b43-4c46-a300-34868be2ee48/design_is_a_job.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e588.bin
cff99b8d19ff251ad538e7e4e29a16aab3cb8e1e77333e38cc448c4fdbe5cea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5516 bytes
font_01_sfnt_off0000f834.bin
a45e25618a28a18a5d9a5045982811a2ac1ea1f8ce29bc728928d3fae8547f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 10812 bytes

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