Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17b0392fb6e7cb…

MALICIOUS

PDF

78.5 KB Created: 2021-06-03 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3c37f78f81d45b5c1cbdab19e2115ca6 SHA-1: f784ed00d2b16565732c7436238191736c48454a SHA-256: cd17b0392fb6e7cb321d586bb7d432d849ed8bea40c2d4cdf174be64a89fbc17
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary URL, https://pistant.ru/pbw?utm_term=bs+player+codec+android, indicates a lure related to media codecs, likely to trick users into downloading malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pistant.ru/pbw?utm_term=bs+player+codec+android PDF link annotation
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/tidejefunajodo.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/4665997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_6002dd473efe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_6050421c2cb2c.pdfIn PDF document text
    • https://wegusolojemirub.weebly.com/uploads/1/3/4/5/134597015/f22e25e97.pdfIn PDF document text
    • https://piwoweral.weebly.com/uploads/1/3/1/8/131856495/vagifagimajo-xudovibol.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/78dd8c84279ef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxaxufudej.pbworks.com/f/when_a_sagittarius_man_misses_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8beaaf4-704a-42f4-9487-c6fc72120c6f/rariwivilobepes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ecd9f7-d7f8-42c8-8102-910d4270c649/elementary_quantum_mechanics_in_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b56c93b-b72e-40c7-b8b5-1ceb461111ce/the_obesity_code_jason_fung_download_free.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/how_to_change_carburetor_on_stihl_ms170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2627cd19-3667-4f08-a4fe-cc8d4fba5169/pogobavavebo.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/tebawu.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/butterfly_line_drawing_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89bf232-4ce6-4a2c-8d6c-c82fee0efb9f/35518146708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/499a1345-bafe-421a-a08c-a1525e41fc33/61921340902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0304ef1e-f775-4224-9e6c-f50ffe2b2ee5/puffin_browser_pro_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8e7bfd-7703-4ba4-b585-e87e7bd039c4/introduction_to_real_analysis_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8083910-5b14-423b-9bc3-bb0bfaf6f6c8/primeros_auxilios_psicolgicos_ejemplos_de_casos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20115efb-9f54-408e-bbec-58e75573d8ab/vawigofab.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5220 bytes
SHA-256: 9427e4490d774e02cda8e857456ca3877eae2e591df53f7cf629c5826d467e6f
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 11456 bytes
SHA-256: 0a6680ceff6ab6a076bfc58fbd2d5518acf9e01aa05cc4b53215078c51434cd1
font_02_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848