Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7afe4f77630284…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 03:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ee17d88962e338abed358afcf6745a SHA-1: 8789de9fdace7df2455e95a0c6532ee80f37ec98 SHA-256: 9e7afe4f776302849f57b7246a17673ba25e42c95dd8ef6ebc92d1e29dadc739
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is `https://dafemum.ru/123?utm_term=electric+tankless+water+heater+sizing+guide`. This suggests the document is likely used for SEO spam or phishing, aiming to drive traffic to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://dafemum.ru/123?utm_term=electric+tankless+water+heater+sizing+guide
    • http://mrshadow.net/capsicum_oleoresin_wikipediaqoon5.pdf
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/9087064.pdf
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/webufofaxaniwozaleb.pdf
    • http://quickstore.pro/66261916175k5d1r.pdf
    • http://kozlo.space/betaflight_4.0.4_downloadgqh52.pdf
    • https://jadikabejoza.weebly.com/uploads/1/3/2/7/132740193/rugerumaxu.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/jusazezatelogap.pdf
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/aa66803a48fe60f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c809053-df6f-4eb8-ada9-2e3a33e31164/how_to_hook_my_directv_to_the_internet.pdf
    • https://s3.amazonaws.com/zexozavo/thinkscript_input_time.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_8f1599093f2945e29d64e0847bb27141.pdf?index=true
    • https://s3.amazonaws.com/laginekux/highland_cathedral_sheet_music_piano.pdf
    • http://daxepusiz.rf.gd/50350969084.pdf
    • https://uploads.strikinglycdn.com/files/165ab0f6-92a9-438c-941e-8e8ee944ca42/lavodoseja.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2326232485934a84a7c1f5660b2b2d1c.pdf?index=true
    • https://s3.amazonaws.com/ritoma/bumbling_crossword_answer.pdf
    • http://gadigoruper.epizy.com/the_stand_at_paxton_county_trailer.pdf
    • http://sowinoto.epizy.com/answer_key_in_mathematics_grade_10_module.pdf
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_69ffba4250014a37b920f99e040ec37b.pdf?index=true
    • http://tororixiranop.rf.gd/11016543262.pdf
    • https://uploads.strikinglycdn.com/files/e979eb48-3a89-4811-a4ac-df6541e068d7/ruwofosojipazegudusad.pdf
    • http://suvokejixu.epizy.com/sat_answers_leaked_2019_october.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_dadfd3e584684493bccf34d34e1b9199.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_off00010119.bin
c7d00f23236e8a76619d9dc3480344da3e84e42772a3f7655e679c9cc0fcd3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 5364 bytes
font_01_sfnt_off00011376.bin
86c7a24fe476050f45a9ab203a33840c912ca4b76c671b8d6a15c8931d3ccea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10776 bytes

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