Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b1ef8daa477557…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 15:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 072f84da84a1943848a66cd481894ad3 SHA-1: 07f91dab2a1ccd3e926f80cdaf20b752b9000489 SHA-256: e4b1ef8daa477557d7b803bc992b8ccf3ff8427cd47468fe0b0c2b91de0692eb
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of external links, with a primary redirector URL pointing to 'https://zajinet.ru/strik?utm_term=itil+intermediate+service+operation+exam+dumps'. The presence of numerous PDF links suggests an attempt to manipulate search engine rankings or distribute malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://zajinet.ru/strik?utm_term=itil+intermediate+service+operation+exam+dumps PDF link annotation
    • https://cdn.sqhk.co/kojetozativ/fgtwhHe/galaxy_watch_active_2_review_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ghbgg7L/83615252152.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/x51CheK/ligaultras_support_your_favorite_soccer_team.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/hjdjdzS/download_microsoft_cortana_digital_assistant_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/fAthgv6/short_gacha_life_part_3.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/jggcfKQ/top_5_tech_newsletters.pdfIn PDF document text
    • http://pufemebulod.22web.org/in_christ_alone_chords_e.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/cKgjggp/fifa_world_cup_trophy_image.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/9Z8jDBf/44174061296.pdfIn PDF document text
    • http://falifipes.iblogger.org/60402163399.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/aDjfy4i/disney_zombies_2_cast_ages.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/akjdjc3/lionheart_tactics_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/agfLhf5/zefum.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/PhdzIcG/lethbridge_air_show_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/VGzgjjc/chicken_worming_treatment_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/ssggMhi/gofofopitamuremezumi.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/T6hidJr/vr_escape_game_apk_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_ca5f4457f4c84f7dbcb6320c842d807c.pdf?index=trueIn PDF document text
    • http://bavajozobe.epizy.com/dekezogozizisogedisadelap.pdfIn PDF document text
    • http://kolitaguligod.epizy.com/professione_albergatore_allianz.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_399e1fd5281d4226986454e77562fa08.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 5284 bytes
SHA-256: 2778bab7c3027c0c9b901a1931b30243682ded0eb1b959029d3655130a0ede01
font_01_sfnt_off0001086d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10640 bytes
SHA-256: 00a2279f19bb846515a87f288e219b163b171e37410e7e401b8153344a0accfc