Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa813e09adbbd1e…

MALICIOUS

PDF

75.8 KB Created: 2021-04-15 10:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 557a16a60679b2394e3e8385d256c9ea SHA-1: db35e022b0de5da69edf5028379ec4f54723f94a SHA-256: 5fa813e09adbbd1ef4e777c4c2c66f0f2f303436bb24401f55c6d73148011dd6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=6.0+powerstroke+for+sale+f350 PDF link annotation
    • https://cdn.sqhk.co/tomubozes/cdZ4ayc/farm_animals_storytime_craft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5ff0162d3a2dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_605d5a5189be6.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/actos_administrativos.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/eoKOgi1/rikekonuvumokigoze.pdfIn PDF document text
    • http://pebonemariv.mypressonline.com/buffet_restaurant_business_plan_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/8BaThbE/kazetolavelidigi.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/iidRwia/sitavefufogesutenowap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_5fd28b320d367.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/PjfjidS/7373813447.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/lejefizaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_5fe8491b21149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_2da3562d40c44cdd89001fe922aa091d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5917a-d96e-4f98-94cf-d91f82262f61/habits_of_mind_for_middle_school_students.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_83e86f8eb0a14ae6bc5dfcbf82c68b34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc68d49-91f4-4170-94b3-88ce4d177ab1/92705081583.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/22850379853.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/jolejudutepumixez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e01f37-c5f5-44d4-b74e-bcab61c58e65/gipijuvobu.pdfIn PDF document text
    • http://wefatuneramab.epizy.com/dexugisujejopitipevize.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_4a84962c9cfc4f4cb7d1b98974f886f5.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/basketball_terms_and_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77c9cf8-6603-4413-bf22-a5cddeb76bc8/how_to_train_your_dragon_1080p_google_drive.pdfIn PDF document text
    • http://mewivoxirogowe.rf.gd/rebumumavexanepunadanoge.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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 5572 bytes
SHA-256: 4c7a593837718ff3c76a03d8c763349041cd6c431bd06203864c2a3ce3fcd986
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 11352 bytes
SHA-256: be99f34405cbd07a45f8a91c869a795390baf6b88e641f62bb4e00ae477d7a3a

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