Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5435d0fc2c87dcc…

MALICIOUS

PDF

88.8 KB Created: 2021-03-10 21:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b41c4a7c1ecbe75d6770ef0679ecad5 SHA-1: 9adf9bde78cb1e63a2ff44d2a61b896b7fbeb115 SHA-256: d5435d0fc2c87dcc17edcf24b289a4ab5b1041fe8f6969049fc8b38a38fee79f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm designed for phishing, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=how+to+determine+cost+of+building+a+home', are likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=how+to+determine+cost+of+building+a+home PDF link annotation
    • http://zokugorevat.mywebcommunity.org/86975158544.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/rameri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_600aab4bbd91c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5fd2833cf3977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_603be7e1063ca.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/4d41dbfc-8ead-4b7a-a686-ee2782362f75/nakivulugezusunir.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_b0d9b16d5a1249028e26dcc540635cd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7babe4bc-8f94-49e7-bffe-b09a1a07342e/360_degree_leader_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe876ef9-be1b-4068-88ba-eead41b9f2d6/can_the_body_repair_itself_after_smoking.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_9dbcb9661421496dbeb40934431c40b9.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/vitokaxorozo.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_47394ea2e5314ecfaff8a64e728c4dac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/27258981574.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_3de57e2689954dd89cd47524eb5b76f2.pdf?index=trueIn PDF document text
    • http://xepuzakudera.atwebpages.com/zesonulivasukorezosexo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/full_screen_video_player_android_studio.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_83bd82519b7a4e0f995758e8a234ff85.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_3ae9f15ccfd44d35b507646255ab5a33.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_8b154b707da249b493a2d15d37586ff0.pdf?index=trueIn 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_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 5628 bytes
SHA-256: 685897c36a531b90f242c737fa935bbdfddd0862896c92f2a8e7da2852888382
font_01_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 10664 bytes
SHA-256: 6962966129c35cf8a4dd8d036d7728714bc5e42b5523bdf6f611e4153acdf50c

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