Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4c1f8c6bd4a80f…

MALICIOUS

PDF

80.8 KB Created: 2021-04-08 03:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acf2a660dec9f7ecacb8d200cee40899 SHA-1: 9084c33f340a70e6127d2970f02b8a2cabb93daa SHA-256: 0f4c1f8c6bd4a80fc8523b08fd710425d2902ca3c42159e4bab9cb04683b7d71
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. ML and ClamAV classifiers strongly indicate maliciousness, with ClamAV specifically identifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to marketing templates, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://pelibifir.ru/123?utm_term=marketing+plan+template+for+event+planner
    • https://cdn-cms.f-static.net/uploads/4457312/normal_606d993536d84.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_600543ad0ebac.pdf
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60498af60c16a.pdf
    • http://sokitejosororag.iblogger.org/adverbs_and_adjectives_exercises_with_answers.pdf
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/5d0c3299ae5.pdf
    • http://nekevofitoruzat.22web.org/wiposu.pdf
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/353a0e.pdf
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/vobufuvow.pdf
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/1191474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kujesulad/printable_english_worksheets_for_kindergarten.pdf
    • http://sabenimuzu.rf.gd/cancer_de_mama_2019.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_928a7cab8e854cc9907a46c9f19880cb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c53647f2-59bf-4bdd-bb10-18690f83377b/vimugojotarokegapuxuto.pdf
    • http://jefurirowa.epizy.com/anatomie_du_coeur_paces.pdf
    • https://s3.amazonaws.com/jeduzizonox/stone_soup_cafe__pub.pdf
    • https://uploads.strikinglycdn.com/files/c98193cd-c864-4af0-867d-14ab710f09c7/83722275991.pdf
    • https://s3.amazonaws.com/papuja/likakakulolel.pdf
    • http://futuwerelak.epizy.com/repituzu.pdf
    • https://s3.amazonaws.com/xakusineba/8733744987.pdf
    • https://s3.amazonaws.com/jenisozazewubo/aaj_ek_bar_aaja_song.pdf
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_a418d3d922e64e5b92408bf8519f4c3b.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_38745128d7244571bd862584a60e048b.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_off0000ff0b.bin
7cf3d2d8de0da3f5cb183938c794b57cded8b2b21cf47f48fe698239f0dba0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 5172 bytes
font_01_sfnt_off000110af.bin
82259ec5a4dac10b30976fa3d98de5593f48cc92421ce0e16e9c4fbc166806e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 10808 bytes

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