Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b83b307c85227c0…

MALICIOUS

PDF

88.9 KB Created: 2021-03-29 12:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 026dd32b1e9a881553fd205cd5a66bb1 SHA-1: e140cbfba344f068e356125096ca7dcebaf17aaf SHA-256: 4b83b307c85227c0c6fb88dc3af63b48547a06042ffc5a276917056af67cf967
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, leading to potentially malicious content.

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://lozipotod.ru/award?keyword=idsa+candidiasis+guidelines+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/pavujakorige/jdibYtD/8495590169.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/luxizaloweforut_mulagivoxakel.pdfIn PDF document text
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/duruwujunatigubelajo.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/nedevot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6033d215d3d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fd17205eb9d9.pdfIn PDF document text
    • https://cdn.sqhk.co/munuseji/icheqCJ/mineral_fusion_concealer_duo_neutral.pdfIn PDF document text
    • https://dizogesutupini.weebly.com/uploads/1/3/4/6/134631076/tuxudadigusuzibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5ff68a93a60f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_603284dc0ad07.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/ibjfCic/world_basketball_cup_game_hacked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5ff79da505753.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ibU6Kgh/fallout_shelter_mr_handy_not_collecting_caps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcb3baeced0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_6008fbc5b178a.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/ed853c6df.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/gfjb5gh/spy_phone_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6030a1109f737.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/hcja1r3/jatejajobul.pdfIn PDF document text
    • https://lewanodeb.weebly.com/uploads/1/3/4/8/134885095/toxodu.pdfIn PDF document text
    • https://mepanegeloja.weebly.com/uploads/1/3/4/7/134759112/niwimesav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_6041f19d4142e.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/dudedi-dokab-sazujozizadisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 5440 bytes
SHA-256: 24bc3f7933c0c46ff7ddae04c4c2c174ebfa0bcaa7b2e960dffe66bc2ee78043
font_01_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 10880 bytes
SHA-256: 09b47c97ca69389fb456ec81d2eff3c6a593b97affd08e59716ddfde721c3058