Malicious PDF — malware analysis report

Static analysis result for SHA-256 d353f29e7624fe97…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 15:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d6278d866095bf179e21429f52a17cdf SHA-1: d502b2375477487f719f6137d646b66d2585d02e SHA-256: d353f29e7624fe97210e36df919082bae27d0955999746697bd11ff5c58a5aa7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous external URLs, many hosted on disposable domains, designed to redirect users to potentially harmful content. The primary lure appears to be related to a "Marvel encyclopedia new edition pdf", which is likely a deceptive tactic to encourage clicks on the embedded links.

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://gimoguvi.ru/123?utm_term=marvel+encyclopedia+new+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/wexunaveb/fggeikp/x_core_piedmont.pdfIn PDF document text
    • http://lenulari.mypressonline.com/66495641627.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/dAji9Iz/69711141837.pdfIn PDF document text
    • https://cdn.sqhk.co/jupemuwaze/jhigjdn/gusesegukoxog.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/dgfG6gd/tosokalaxexede.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/q9Lhaii/nikujogepenurokutujuxo.pdfIn PDF document text
    • http://goldstein.berlin/11237952973s33oe.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/Rhgjjzv/20991324937.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/what_are_the_steps_in_production_process.pdfIn PDF document text
    • http://smeh-mif.space/kidovudezogoxesct1ep.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/jeRzEhi/dozofevepikekifefarezak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_004aca578eb84a9ca8ef01c6b85b7bdb.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/percy_jackson_film_3_trailer_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee56ac98-dcef-4d04-8ba3-5da6f89667b7/sowura.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_682992382cb84b7eab673816c99f6d9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ef4506-4e67-47d2-8f31-4c54f5dfed01/mediasonic_probox_firmware.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_85a88fcf3dc24d96a6a77d08983273fb.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_4a5c765784ae4c3f9984931ba553ec5c.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_39747db605b3442698df0a7202682c7a.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_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5232 bytes
SHA-256: 619e4e6960a886fbb1870f7ff9439a50fb35895fad197648612a6a331737652c
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 13560 bytes
SHA-256: 3c1cc8168329f8ad524cfd97cb2827a10c8f3ba92f45e8c58072ed996d70f95d

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