Malicious PDF — malware analysis report

Static analysis result for SHA-256 794860fcce707337…

MALICIOUS

PDF

75.6 KB Created: 2021-03-08 19:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8cb4f81bdf80e554e152683e7789a1c SHA-1: 74b52ec6902f1f39fc2b32f788adcda6523e890b SHA-256: 794860fcce707337e77e7cb6f2b7f2eb13f2557b445c8e8e7e2da04d4f9e69a5
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with at least one suspicious URL (nipisod.ru) and two other unknown URLs, suggesting a link farm or phishing attempt. The presence of embedded PDF links and a 'download button' heuristic further supports a lure-based attack pattern, likely aiming to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/123?utm_term=corrective+action+report+template+free
    • http://slampochka.ru/raripisatezir60p85.pdf
    • http://study-english-04.space/dividing_complex_numbers_worksheet_answers5vjqk.pdf
    • http://wei-nmvc.com/kagigiwaw0ypb.pdf
    • http://securespot.ru/tosofotiwonakolovakovofil0c2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61c39007-dd0f-4ad4-92cf-721d5b881306/jujumopegupetuwike.pdf
    • https://uploads.strikinglycdn.com/files/117d9c66-af7f-411d-818c-123e7c08aa19/44473967030.pdf
    • https://uploads.strikinglycdn.com/files/7c6ffd7f-5715-4446-beb9-9f51eb479277/chicken_soup_for_the_soul_think_positive.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/35118797497.pdf
    • https://uploads.strikinglycdn.com/files/301bc98d-eefe-4b6e-9e95-9be14392f71a/how_to_use_hamilton_beach_easy_reach_toaster_oven.pdf
    • https://uploads.strikinglycdn.com/files/2197bf92-a7d3-42ef-aa79-1453764cb481/football_manager_2016_best_buys.pdf
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_fd7f82a3a21444e09834cb26c8ba0b26.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_92fb22da4c95416ea5b2e4fe3dfda32c.pdf?index=true
    • http://xifabemifuxiza.rf.gd/99046730585.pdf
    • https://uploads.strikinglycdn.com/files/9b15c6bf-83a3-448c-b4fe-eb825d30dfdd/52834474263.pdf
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_8b145b096f2e4d5b9560689401c3a9c5.pdf?index=true
    • http://sozazibelafi.rf.gd/vapezul.pdf
    • https://s3.amazonaws.com/mipeboro/monthly_management_accounts_template_excel.pdf
    • https://s3.amazonaws.com/sifawekujiki/84543521355.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_off0000ebf1.bin
10e5dd5fb9c26d6003cabadc220cb9ba80bb4c594e457f4a8c3342fec960be0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 4948 bytes
font_01_sfnt_off0000fcbf.bin
db0fd28e5c064179444c7f403105f29c15cf231eeb15474632a23a1b5dbed251		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10660 bytes

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