Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bc3fdb2eb43a0d…

MALICIOUS

PDF

76.5 KB Created: 2021-02-26 22:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e28cc00e2f1aaf2dda351bf74a118257 SHA-1: b3b244551175d56caa6335281b2a06fb46aea511 SHA-256: 03bc3fdb2eb43a0dc09a02c7e8421a25d1e6cd2c9f8eefe11a97294cffcf325c
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized domains that host further PDF files, indicative of a link farm or phishing campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The document body, while heavily obfuscated, contains strings that appear to be song lyrics, likely used as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/123?utm_term=on+my+honor+i+will+do+my+best+song PDF link annotation
    • http://shoes-storie.club/fapuzer36sx5.pdfIn PDF document text
    • http://lufatomitonad.22web.org/apc_ups_rt_1000_manual.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/7549460.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/e9b3a61543e2.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/wigomimzlwug.pdfIn PDF document text
    • https://pemanawawe.weebly.com/uploads/1/3/5/3/135320082/bbf31016853f.pdfIn PDF document text
    • http://legko.travel/4460566817647cty.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/dewam-walobozowu.pdfIn PDF document text
    • http://flowerport.store/fizeze1bru0.pdfIn PDF document text
    • https://mogorabijeruli.weebly.com/uploads/1/3/1/3/131380728/tunuxa.pdfIn PDF document text
    • http://otshelnik.net/king_bernard_musiclw7yl.pdfIn PDF document text
    • http://ryursew.space/first_steps_in_academic_writing_2nd80rkk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokelur/29925130801.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/cheat_engine_android_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/ditedevoxuwipifepewim.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/begin_again_3_ep_7.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/ni_m_vodka_lagake_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/sheet_music_reading_practice_game.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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 5392 bytes
SHA-256: b4f4c5f4a44ff53e37bfad673bb8435ef1d8953a14f2ea3e78ba74787eeda403
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 11124 bytes
SHA-256: fe9c768bef7643b2df0e5b1537e5e3746cc14d477ce5b3943572abf19f79165b

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