Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde12763b7bde5ee…

MALICIOUS

PDF

74.3 KB Created: 2021-04-06 20:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da709cb46a4441bc323c7c607bea600f SHA-1: bb3a0803b2ea4294e64cf7090eb3467dbf26fd94 SHA-256: cde12763b7bde5ee1da1702c592b0fd86b41fd0bfcf3a1b2fadcd224501308b1
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 point to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://lozipotod.ru/award?keyword=anemia+definition+pdf
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/bagagete.pdf
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/vavavajutone.pdf
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5fc5c7b0c662d.pdf
    • http://themarkuzmusic.com/is_there_going_to_be_a_land_of_stories_book_75ins8.pdf
    • https://bodujifoji.weebly.com/uploads/1/3/5/3/135394102/dikavetafuzo.pdf
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5ffdc3f8d3478.pdf
    • http://testertumentum.space/mississippi_drivers_license_real_id5m4aw.pdf
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/kunomulepi.pdf
    • https://cdn-cms.f-static.net/uploads/4493600/normal_602207412af73.pdf
    • https://cdn-cms.f-static.net/uploads/4480755/normal_600bfdb77ff07.pdf
    • http://wasatosu.sportsontheweb.net/philips_universal_remote_codes_for_sanyo_tv_4_digits.pdf
    • http://kleomaften.online/ieee_power_electronics_projects_downloadvzg10.pdf
    • https://jiwefirufij.weebly.com/uploads/1/3/4/3/134370204/lotoditefivelo.pdf
    • http://getliterate.online/pedometro_app_per_android82mfr.pdf
    • https://fuzipoxo.weebly.com/uploads/1/3/0/8/130873840/1153969.pdf
    • https://wutarodopa.weebly.com/uploads/1/3/4/2/134266687/d278c465021e6.pdf
    • http://shothard.site/vogivoxanarurozizudefewesa7bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dupepoge.onlinewebshop.net/cambridge_international_curriculum.pdf
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_b3782610ec0a4a44a4a8c2ea9d80f456.pdf?index=true
    • https://2978fa49-077f-489e-bef2-0e177375ffd3.filesusr.com/ugd/50ba8f_9ac62382e9a049b487a3bf3c83307d0e.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_13e4e9adb65a4d2d88c680d67427280d.pdf?index=true
    • 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_off0000e7ee.bin
293c3f65eb3f1eaafc590985159be3dd10bbde5e65cd0b7b403b33563b640280		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 4868 bytes
font_01_sfnt_off0000f872.bin
1f2a4847a4ec87654a97d812010e4e05e0a6c08232e41251a953abcb712b5b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10436 bytes

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