Malicious PDF — malware analysis report

Static analysis result for SHA-256 97710233c063eec0…

MALICIOUS

PDF

72.7 KB Created: 2021-04-30 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1cb37822d7aff5754484a9f3d4f42801 SHA-1: 104a52eb3143a73a0b8faad5f5f366a995a2d84e SHA-256: 97710233c063eec0b38084b354ff87226e44698f8f517ced0290529a2dec8bac
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 0.9997

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.
  • 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://leonvi.ru/strik?utm_term=decision+tree+sklearn+github PDF link annotation
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/7624b0b7a3.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/2dc442.pdfIn PDF document text
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/zevududeruwe-lozun.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/loderexebazimu-navonotironum.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/bibonef-koxulovol-dinegafoz.pdfIn PDF document text
    • http://rituralajozeli.iblogger.org/3660569007.pdfIn PDF document text
    • https://gokodasev.weebly.com/uploads/1/3/5/3/135339924/zewexazasu.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/xaduzesipob.pdfIn PDF document text
    • https://maruvape.weebly.com/uploads/1/3/4/8/134854924/8845402.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/8641119.pdfIn PDF document text
    • http://fakutavavuzixin.22web.org/revuzikibagar.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/a9e38402.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/d7a352772076308.pdfIn PDF document text
    • https://menikevolag.weebly.com/uploads/1/3/4/2/134234624/ludurub-sigodewebuzufo-dugonobi-medagoxut.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/vilufoxuwud.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/vefagotoje/reflexive_verb_list_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/interior_design_basics_book.pdfIn PDF document text
    • http://godavuvexo.epizy.com/rose_publishing_deluxe_then_and_now_bible_maps.pdfIn PDF document text
    • http://gemakeruw.epizy.com/oreck_xl_commercial_parts_list.pdfIn PDF document text
    • http://gikunipif.epizy.com/22346478668.pdfIn PDF document text
    • http://jizonizop.rf.gd/jamtrackcentral_jam_tracks_free_s.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 5264 bytes
SHA-256: d83d230cc80596fa15af96189b84f3ad1f9d44c25fa5a63d66f2535c4b013529
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 11856 bytes
SHA-256: 1ffbeb23e08007e6ec9b52a704edb3a285a76493ea7105cd41f45723b9767b80