Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9aac0ef549805e…

MALICIOUS

PDF

80.0 KB Created: 2021-03-04 21:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0ece7998a4463d599ea969a2e83bd2cf SHA-1: 14cba0cea2e9710cc7cf20f88562e96b85a39eb5 SHA-256: 7a9aac0ef549805e38ec760ac409eb24ec312655465c43998575905d6bb3bb3f
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 0.9957

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://botokaw.ru/123?utm_term=el+dador+libro+resumen PDF link annotation
    • http://fizasibako.22web.org/79924339056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416935/normal_5fc5c7b7e1425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fe186b4a3b35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_601403599b42b.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/0e349226e.pdfIn PDF document text
    • https://daseguvemorog.weebly.com/uploads/1/3/4/3/134357845/7306321.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/canon_sx160_battery_charger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_5fd626031673e.pdfIn PDF document text
    • https://tovalikesugijid.weebly.com/uploads/1/3/4/1/134108564/muduluvojilo_xomavotasalijof_razesejuwelages_kuxofoxixuveli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_602c437f29d65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fcced0dac37a.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/8051641.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/123954.pdfIn PDF document text
    • http://lavijowonuxogu.22web.org/bicycle_casino_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414487/normal_60072eef9d5dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_603cb54178306.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/hp_photosmart_plus_b210_printhead_cleaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_5fe6cfb1c6355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_60357a6ab9ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_6030933e42d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_603b6530a8d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_601543f0ec289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogidide.epizy.com/xapovaferu.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_to_play_ukulele_a_complete_guide_for_beginners.pdfIn PDF document text
    • http://wofelekupobepo.epizy.com/toxumozidexabokis.pdfIn PDF document text
    • http://butaxogusevi.epizy.com/yahoo_fantasy_football_cheat_sheet_auction.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/83422571415.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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5068 bytes
SHA-256: 22dd72d64bd407ce3d0f193b524c1d0bcbe75785654a31c4848e1cb7c81c978e
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 11660 bytes
SHA-256: 06456b632091797b734f6cfc20940c133b3b48f24374c692439d61ce88466793