Malicious PDF — malware analysis report

Static analysis result for SHA-256 26266dcdb5efdc42…

MALICIOUS

PDF

96.3 KB Created: 2021-03-17 15:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ff27c890a3ac40a493cd2d9f30c1103b SHA-1: 56157f7e8123768065153698f87e25d2a6523762 SHA-256: 26266dcdb5efdc42bf6e2962202a9f456692cf5e302dce1df215b34d879c722a
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://maypoin.ru/award?keyword=the+adventures+of+tom+sawyer+comics+pdf PDF link annotation
    • http://guzexesuge.mypressonline.com/how_to_reduce_acne_marks_naturally_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/ifPjjgL/xudutukutomogedabemakibe.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/lightning_arrester_price_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5fd76f8a4de2b.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/e3xsheC/4148336292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fecfa1263815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_600043a883293.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/kenmore_400_dryer_heating_element_part_number.pdfIn PDF document text
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/9078648.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/avatar_comics_imbalance_read_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_601b1d1ecc30e.pdfIn PDF document text
    • https://vitojeji.weebly.com/uploads/1/3/1/4/131453493/5390266.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/29f61951-3203-4874-9043-d490da421dd6/ganufaxugaxajaxenavinaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075981e9-c7b3-483c-8937-e7168902d53e/27863843038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4216b52e-9ce7-4003-96da-769ca25e26fc/28910681362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46dc57d-16df-462d-b947-22eb3bb7bf6f/all_about_share_market_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a3fddf-bdc5-4a75-ae6a-fc90701ab4ba/how_is_zone_of_proximal_development_used_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691062c1-8c80-4f48-800b-505a60f9f15d/malapixobiwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6cddc1-ab10-4c53-98e8-176b1e3fe7ba/kenusimavafijugabumenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d847814-758d-4871-9f19-9c4eff636880/5216110786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0587ec7-5458-42e5-995b-361c353e2be0/netgear_genie_not_connecting_to_internet.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_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 5568 bytes
SHA-256: d120dfbbacf1135ceda24e876e441311ce72fbde840fa54f946ca8c7db1003f0
font_01_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 14496 bytes
SHA-256: 24af997ef1c46c589c8a896d824a91a3cc70a62179351a74fff6754e71ceef46