Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab36994f68864a8f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-28 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 256e5a03eac8d96abc61dcde4e7d5d0f SHA-1: e4f34739a919976a775c68ad11a59dc1b44fc624 SHA-256: ab36994f68864a8f7ce4160ceab8eb9a688412f9681685f8a6f4bfe14fe5588c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. One prominent URL, 'https://druttle.ru/strik?utm_term=windows+server+2012+r2+disk+cleanup+winsxs', appears to be a lure for technical information, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=windows+server+2012+r2+disk+cleanup+winsxs PDF link annotation
    • https://cdn.sqhk.co/fubafonu/jhjbcEs/olympics_2020_logo_plagiarism.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/3154343.pdfIn PDF document text
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/ruxitudigolidamemege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_605d9bee92122.pdfIn PDF document text
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/xevunitekavilelusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_601b43e2233a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_603eab092e26a.pdfIn PDF document text
    • https://zogowejodumuf.weebly.com/uploads/1/3/0/7/130775171/5996936.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/cchdsdi/difavesa.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/kasurikufuvek.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/cjiCW1o/77709179027.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/11d25afe-fa3f-4e04-836e-303592d5b519/how_much_is_smart_bracelet_in_nigeria.pdfIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_fa8db85eb5174ebdbf1d7035b3388568.pdf?index=trueIn PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_053bf922223543318b86d212fe85af89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a90742-3b63-4d08-8f17-a70bf84b23d3/88374401130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b77c2b-e95f-47bb-9d2f-082402ae81d2/nancy_drew_games_download_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261cbb4c-e11c-4233-87ea-d81a3e51103f/lopoturebepam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48b8a81-e79e-4865-ac1a-98406511273a/graphing_quadratic_functions_practice_worksheet_complete_the_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156c6fac-20f3-44e5-9359-670de6f2490f/asus_rt-n66u_speed.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_5362845e50e84e3299ed5466c1bb71aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d82162-f9d5-462f-a3f0-f4c686bde60c/39003840933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49908e9f-ef1c-4f47-a434-8ce0d91dc180/does_the_roomba_960_have_smart_mapping.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_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 5692 bytes
SHA-256: 80082b0c0c69e9a3e6892eb6f23206f569ca99073e67bcb353b083fe6666238b
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 10400 bytes
SHA-256: 5e1137642e48314fd5be9c121f2af93986d5963961ef57eab38578c2305758fd

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