Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b91cd29609eca90…

MALICIOUS

PDF

80.2 KB Created: 2021-04-23 22:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f34e3e310c34a05566a9132ffef54a9c SHA-1: 61e0c9832b3f71c602ea7d55c7576acc6318d098 SHA-256: 3b91cd29609eca90f48217d3a6adfee4098a4cfc2e95ac84492cdc33e5227f62
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URL 'https://xezojetit.ru/strik?utm_term=how+to+update+hulu+app+on+my+lg+tv' is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=how+to+update+hulu+app+on+my+lg+tv PDF link annotation
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/pififutesobumed-gufulipuruxepu-bebeniv-ligepafuvenozuk.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/dotimati_rirel_navemezili.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/jefjbij/guarantee_letter_format_for_loan.pdfIn PDF document text
    • https://pezibusogesa.weebly.com/uploads/1/3/0/7/130739584/fibenat_pezejixifesek.pdfIn PDF document text
    • https://vebaruroximowut.weebly.com/uploads/1/3/4/3/134342498/9a642.pdfIn PDF document text
    • http://sallely.xyz/why_are_clothes_not_drying_in_dryer7wzmy.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/iHgdidb/mpl_premier_league_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/M1vfheo/apostolic_faith_mission_membership_form.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/waderopogiretasuv.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/bicjgqc/sago_mini_robot_party.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/fnyNckr/24955471668.pdfIn PDF document text
    • http://stassikorskyi.com/auld_lang_syne_piano_chordsuw723.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/bDNhgja/12111672458.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/gphcegj/bones_series_6_episode_guide.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/gixawetopoli/what_god_wants_for_christmas_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/dijobedejoledatafukesobo.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/51215417526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2dfc77-1f33-4346-86a7-7ada7b80dfa1/kijebinigizoxususukewojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9286eb15-0b94-49df-ac18-b4b4043f546e/how_to_write_amazon_book_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb98d7dd-3011-4e37-ad35-324292f013dd/85411564035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/999f76f9-2eeb-4658-a252-c44f853160b2/how_to_reset_password_on_hp_pavilion_dv6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfd8d24d-bbaa-4d74-9969-d13a459cf58e/doregesezadeserilipefibij.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/jirosuxufi.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/formattare_una_chiavetta_usb_protetta_da_scrittura.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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 5316 bytes
SHA-256: c587ca8d05cee0889c6c1f659cdd0aaeafa3bd1c822193878242da56d88f51fb
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 11332 bytes
SHA-256: a8cf97751f7a67e0dc7caab7bea1b38f5758ce823ddd0c17fc310005b9d59a5c