Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fc7e77e6ce9b7a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-11 07:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 17974c160f15647777c266aeac5d7211 SHA-1: 07627911d1ab788d580780fd7e14debce26698a6 SHA-256: e4fc7e77e6ce9b7ad922e3ad79d5c2f3b549631cee3b2e3cc0d83c91c7e16358
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDFs hosted on various domains, including disposable ones. One such link, 'https://xezojetit.ru/123?utm_term=temple+run+game++uptodown', suggests a potential lure related to game downloads. The presence of embedded URLs and the nature of the link farm indicate that this document is likely used to distribute further malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xezojetit.ru/123?utm_term=temple+run+game++uptodown PDF link annotation
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/e90f4.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/H7Njjhi/esl_reported_speech_exercises.pdfIn PDF document text
    • https://waretopaze.weebly.com/uploads/1/3/4/5/134529701/895cec.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/1684782.pdfIn PDF document text
    • https://milevewon.weebly.com/uploads/1/3/4/0/134041257/fukerutesazifow.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/fgfjijd/70s_music_love_songs.pdfIn PDF document text
    • http://marafonsport.site/how_do_i_get_an_iatf_certification3vmta.pdfIn PDF document text
    • http://belkwigs.com/train_or_taxi_from_paris_airportqgr6u.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/bibMQgd/paragliding_simulator_app.pdfIn PDF document text
    • http://ogranicbio.fun/my_breakup_diary_imagesbna0b.pdfIn PDF document text
    • http://mon-cmso.best/dokobajamasifovegmck9.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/overhead_door_model_455_troubleshooting.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/Xsxjdgc/65095620514.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/a42e922a-ae62-445f-9031-ee50b08df738/how_does_globalization_affect_the_world.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/what_is_the_romeo_and_juliet_law_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d597c9-f80c-4da2-ad38-dd8d3b4af3f4/10517486145.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_846adbb71b634b389b6201c48ddeae61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4eb3fa0-3f13-4794-bef9-1a8645ae88e4/huckleberry_finn_audiobook_chapter_12.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_6ac0e635b9a44f9094cf161c10c19ddd.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 5144 bytes
SHA-256: 09d32caaf17ee6761ad23db621c03c0c3bc9990bfaf2dcb4eed8e6df37f24f2f
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10332 bytes
SHA-256: 121dd6a20b1c7c5f61f3ce4265ad8c8a4eea8f65c318c530ae5503ad145bf26d
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2