Malicious PDF — malware analysis report

Static analysis result for SHA-256 635046d9a10a016e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 21:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca24ce06bcb8115fecf74929c9471254 SHA-1: 54c2849c3ce7a8894de33d24cf27af8cf5df6896 SHA-256: 635046d9a10a016e2c4b66c4b96641d57a75ed288d2d4dd998b9717ed09b0cd7
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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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=solving+literal+equations+worksheet+pdf PDF link annotation
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/pazarumotekikuted.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/nubadux.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/XifJhfI/92147778766.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/pofavewigibuga.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/467d715d8.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/negowi.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/lusesa_xaluniwav_wananuwexub_simig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5fcd1620bed76.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/muxiseteb-dujulanipavaris.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/datakat-sapakuwifenu-girinijudi-sexuzomus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_602cfdcc21e28.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/tijobezokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_6038937fc71aa.pdfIn PDF document text
    • https://cdn.sqhk.co/nibijegun/xgdhgWA/female_love_songs_80s_list.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/gigeduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600dba5c9ae59.pdfIn PDF document text
    • https://zewajala.weebly.com/uploads/1/3/1/3/131398225/6154086.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/4508630.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/6e064206-84b9-4ca2-9989-0b6f029962c6/miratetusafenituzetoviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c65c3a-7063-4c30-9211-3804da00cb0b/79811862478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926d0201-180b-4c4c-904e-ade96e302e2e/suxozokexuzif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb36073-fc44-4cb9-9592-3906e2693eab/kabc-ii_scaled_score_ranges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291d11d4-1a28-4c19-8eab-82dc8d98783e/xvid_codec_virus.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5748 bytes
SHA-256: 11b8d868caa4b43b54c1b874b19f6b93c7fd29ed660ae240fd883f0505063ee8
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 10412 bytes
SHA-256: f53d6d29bc2961c5ba287dad5e40a9258471cdb7076a0d7bc1319dbe1388af32