Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfd6bd027860f84…

MALICIOUS

PDF

74.9 KB Created: 2021-03-26 09:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a8d57c9eb365161e343e164edabfc25e SHA-1: 01b658b50fa8c309197592e9bee1dc35c42dbcbf SHA-256: 3cfd6bd027860f84f0d6aadc7ed20917d754adf4a8e63189fe9cc0d4fb259d5a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'piano sheet music', which is likely a pretext to disguise the malicious intent of directing users to potentially harmful external resources.

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 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://seumenha.ru/123?utm_term=here+comes+the+bride+piano+sheet+music PDF link annotation
    • http://opt05.ru/avg_free_windows_vista5sib1.pdfIn PDF document text
    • http://tegor.xyz/87894887000d6nm0.pdfIn PDF document text
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/034922.pdfIn PDF document text
    • http://cherrypimp.online/ingersoll_rand_ssr-ep50se_parts_list86h2l.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/javafomepogelulef.pdfIn PDF document text
    • http://mesretly.xyz/mikuvipusosevedakin7lfwh.pdfIn PDF document text
    • http://pikogoxo.iblogger.org/wukizipibenemozojosujux.pdfIn PDF document text
    • http://doweryklkq.space/91818907044ehhv4.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/vewox-mojifatimupobil-tunaferotozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abb0a18-d060-4710-8d8f-689c26fb7bc9/what_are_the_5_elements_of_game_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e585da-7fd1-4f73-bb0b-39e616f1b612/simosarigusalidorov.pdfIn PDF document text
    • http://pilulozames.epizy.com/how_to_find_registered_sex_offenders_canada.pdfIn PDF document text
    • http://letibeboga.rf.gd/vemolujijumopiwuputufad.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_fa4d2f8e086e41dc9b6093a3f58e271a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ee4bbe-d38e-4268-b2a3-a4d672b8c04a/18602760060.pdfIn PDF document text
    • http://morisexisaxewa.epizy.com/31048293901.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_861b9605b0b44022ab305c27df90e841.pdf?index=trueIn PDF document text
    • http://sipukerafabule.epizy.com/lol_caitlyn_adc_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aab5a11-9913-48f0-a603-0ca2988e415b/lord_of_the_flies_sparknotes_chapter_12.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5380 bytes
SHA-256: 561eea7fb696ddb800921248baf74be2013b7462a55a2281eba0da692cbf25f9
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 11064 bytes
SHA-256: 35cdbf2cb269412dc94d6cfca51ed8bfea28c946dae8e08510210743463ff858

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