Malicious PDF — malware analysis report

Static analysis result for SHA-256 d976bbd116dc0e68…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 17:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6dd909012f10227f7818d6aa890b56aa SHA-1: 9f5c10949054d1faa90e02c49379ede0df40d639 SHA-256: d976bbd116dc0e686ef8d03199604ceed81a0ca5ebfbdfd504558669bbdce51f
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 or phishing operation. One prominent URL, 'https://zajinet.ru/strik?utm_term=badger+garbage+disposal+stopped+working', is directly embedded and likely serves as a primary lure. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/strik?utm_term=badger+garbage+disposal+stopped+working PDF link annotation
    • https://resagivet.weebly.com/uploads/1/3/1/3/131383325/4246347.pdfIn PDF document text
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/vujibetoma.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/5502724.pdfIn PDF document text
    • http://hamlikjorettoop.ru/mcquay_microtech_ii5sd06.pdfIn PDF document text
    • http://amandeepsadyora.com/ultrasonografia_ginecologica_bajo_arenasygfch.pdfIn PDF document text
    • https://gukikaxut.weebly.com/uploads/1/3/0/7/130775725/127865.pdfIn PDF document text
    • http://gelixovuxa.22web.org/33592237035.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/vekogaponovip.pdfIn PDF document text
    • https://wozuxepu.weebly.com/uploads/1/3/4/4/134478893/kiseguwogoxal.pdfIn PDF document text
    • http://digitalmicroteter.xyz/56090029025d3ryw.pdfIn PDF document text
    • https://lipofodimeduwep.weebly.com/uploads/1/3/0/8/130813747/miraxijekikolaget.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/4942598.pdfIn PDF document text
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/aad1e7ff358f1bf.pdfIn PDF document text
    • http://urro-hu.com/zomusupamotezewaw8ulkp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_26ecf16d6a3c46e0919d43581cbc17ab.pdf?index=trueIn PDF document text
    • http://bomiboduju.epizy.com/what_is_the_formula_relating_acceleration_velocity_and_distance.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/manual_usuario_fitbit_charge_3_espaol.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_3c2ca1effff64af894b4f29363d005fb.pdf?index=trueIn PDF document text
    • http://ravuxigud.epizy.com/los_verbos_regulares_en_espaol.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_eb7d2d9ce8c740a8a721ec6dfee9877a.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_1cc557a967f54a95b9430ef728bac073.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_64509bccd7404125967a008fdb8f89a2.pdf?index=trueIn PDF document text
    • http://tuzekejaxegis.epizy.com/triple_negative_breast_cancer_review.pdfIn PDF document text
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_2bd481fd9c1c44e38c351f693bd59361.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_216f1bf0b12b4af29c29004192280c27.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_64e85c8ac91c4026acd17a61a2484efb.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_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 5472 bytes
SHA-256: d295fd19cb20bdb52c988d9cfa489034c1d698243b59408695109203dbead20d
font_01_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 10536 bytes
SHA-256: 7f6313ec7a9dbe8c0607ffde64aa1cd450b7c8585a4efcd59649318a0b406faf

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