Malicious PDF — malware analysis report

Static analysis result for SHA-256 410825829d9d37bf…

MALICIOUS

PDF

72.3 KB Created: 2021-03-29 02:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dff94e89ec943a9dc01492a69c8896d3 SHA-1: da0c9773ce7a74ed1d35db44dfc76ddd76e388ea SHA-256: 410825829d9d37bf336b9f13a4edbbbc43eab79cc0f554782ff95472b919a0df
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=assassin+values+list+2020+may PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460076/normal_604645346584a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_6039ac7bb65e4.pdfIn PDF document text
    • http://korirojasutito.22web.org/kilolabamutaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_6008d4e136fd6.pdfIn PDF document text
    • http://zesisoxesevi.22web.org/class_9_english_moments_chapter_2_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_604a571c9f482.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/bedoro.pdfIn PDF document text
    • http://sijagad.iblogger.org/darts_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_426a2873983d435aa95f5defb37cd77c.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_3f47338330e24a91abc0108b888dc937.pdf?index=trueIn PDF document text
    • http://nelivizazepafo.epizy.com/mexuju.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_ecdf0665712748c39001e828a6a71f01.pdf?index=trueIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_5d8305f6a89349fa808bb14eb86d561a.pdf?index=trueIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_388e3e7b45094027a2b970c2dd60607c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c39758-fade-4b22-8674-3fc8e825f123/how_to_restore_a_samsung_s7_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb61e4a0-3856-471f-a6d8-cdc96a1d91fd/shadowrun_returns_best_weapon_for_mage.pdfIn PDF document text
    • http://sonatalub.epizy.com/examen_toefl_contestado.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 5160 bytes
SHA-256: e5f721f2668427e87513c6034f5f627ed410bc482e1bdd87fdad90d8be5c1e02
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 2512 bytes
SHA-256: 4dce65651168509d23c29733f7150cf533a8e6ef747e4a2aebe96b50709536f0
font_02_sfnt_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10592 bytes
SHA-256: e2b3658a1057c774bb1eeace8e86be78e2bd6f235143c6f30deddfef0b24e05b

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