Malicious PDF — malware analysis report

Static analysis result for SHA-256 384c7f573c70ff92…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 22:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c6a2b8e3b76bda0aaf01cfc3bbb8b278 SHA-1: 69679d1985acedd2757907966504282716c5b6a2 SHA-256: 384c7f573c70ff92035426c91e3931dceaacfce0d0530ab8566bdd2f79bdabfb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are embedded within the document body, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs further supports the attack pattern of directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=lincoln+mig+pak+140+vs+140+hd PDF link annotation
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/najagu.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/6238621.pdfIn PDF document text
    • http://worldthailand.fun/breeding_netherland_dwarf_rabbits_colorapydt.pdfIn PDF document text
    • http://pubgucbayim.com/nixuwivoxaxosub37y6.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/didovuxofijazopumo.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/i_have_lost_my_way_book_free_download.pdfIn PDF document text
    • http://deemonatrafik.xyz/jujusefunazivojmcc73.pdfIn PDF document text
    • http://proita.fun/zatesoxajonab2irvz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://151dec52-cf20-477b-a401-a68195eead79.filesusr.com/ugd/8538f4_26bd5c9496e649128869f316b6b08534.pdf?index=trueIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_62186ca4ca31480fa96b821bf00ee064.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2663e17c-e094-478c-864f-06ed623fd901/jumperoo_weight_height_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc33b1f-2cdd-4a86-985a-ad20e57e3efd/sony_str-dh500_receiver.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_b4e94d92a92c44c48e76ff6720783475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/fajopiberizefozef.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/rufitiguvimotuk.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/mega_construx_masters_of_the_universe_castle_grayskull_ggj67_building_toy_for_collectors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96d064d2-6810-4ec0-86f5-dab49deb3236/tezelesojedovat.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/coleman_sportcat_catalytic_heater_instructions.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 5740 bytes
SHA-256: 658e5d7b533957fb963d6f480af124a6006dc1918f78831ba0f2ad7d4f71ad56
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 11524 bytes
SHA-256: aa6269562239c368db2838c760374d6307f138ad4e255d7c76e930e496d69ac8

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