Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6250bd82d0c46a…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 12:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332d298690122254a8bd81ac0db9c813 SHA-1: 56d3dd9cb74e61cb3cac07c34543a0379cd70d5f SHA-256: 4e6250bd82d0c46a2442de513201640eda5c0ce2b1b6dada4d58828e741e00fd
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 SEO-optimized and point to other PDF files, suggesting a link farm or content stuffing tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=hp+m3035+mfp+service+manual
    • https://cdn-cms.f-static.net/uploads/4422133/normal_60462a6b13880.pdf
    • http://slimerecipe.org/i_ll_see_you_in_my_dreams_ukulele_tabs__chordsjw49j.pdf
    • https://cdn-cms.f-static.net/uploads/4450045/normal_60541b643d0e7.pdf
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/dufovidami-noteku.pdf
    • https://static.s123-cdn-static.com/uploads/4402951/normal_5ffc13b6c4f88.pdf
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/f6e1020.pdf
    • http://rusakova.space/minhajul_abidin_imam_ghazali3rxqh.pdf
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b66494d77a.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_6052b4f36661e.pdf
    • https://cdn-cms.f-static.net/uploads/4470399/normal_60130623a18ec.pdf
    • https://static.s123-cdn-static.com/uploads/4374181/normal_5ff6941e8e6e4.pdf
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/guludud_boxaj_vufagenilipezum_zifojilofezikor.pdf
    • http://legalvictory.group/19345454318jcpaz.pdf
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/nogusik-selakurapovin.pdf
    • https://static.s123-cdn-static.com/uploads/4366993/normal_60064688c1ab8.pdf
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fef0ad5724a9.pdf
    • http://zutumufedige.getenjoyment.net/lewenuw.pdf
    • http://xubanapirobula.mypressonline.com/programming_abstractions_in_c_solutions_manual.pdf
    • https://tosixugiza.weebly.com/uploads/1/3/6/0/136052785/foxipoxuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_02122f9f81e94f2ab62b693b4072c6ff.pdf?index=true
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_cc8b1c4c646b426da9fc7313485a8c73.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e802.bin
3d95d3cd1fd57449f77a9270886a6cf180c0fe9b3eb568d91e0073c867d89293
pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 5304 bytes
font_01_sfnt_off0000f9ea.bin
3b13da21cc7ef7e673c47020c47cf1a4455657ed9c18b43a38efe57a320f1e05
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10492 bytes
font_02_sfnt_off00011dc7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 4324 bytes