Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bbacce25b12e2c…

MALICIOUS

PDF

81.7 KB Created: 2021-04-04 08:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b516202eac11125c71d1c89d1bf2bab0 SHA-1: 109b3e77d6b64319fd3d6677e64d2de0b7d7e59e SHA-256: 01bbacce25b12e2c5c2c2f5d00d839c1a91dd22c2ce572896f2bee595cd630a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=ap+calculus+bc+sample+examination+iv+answers PDF link annotation
    • http://zifeladawu.scienceontheweb.net/web_page_to_converter_chrome_extension.pdfIn PDF document text
    • http://arnautmebel.ru/jenatx8kka.pdfIn PDF document text
    • https://linugezi.weebly.com/uploads/1/3/4/2/134265501/d92f11652785a0f.pdfIn PDF document text
    • http://theandyhong.com/6273015177hdvz4.pdfIn PDF document text
    • https://gekirexuwiri.weebly.com/uploads/1/3/1/4/131452917/9721331.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/mategeze.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/5196116.pdfIn PDF document text
    • http://godisibipuvam.22web.org/19794637973.pdfIn PDF document text
    • http://crysety.xyz/how_do_you_pronounce_the_german_name_ute9mdwg.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/d51ddce7-e71e-4a05-a565-7c5a5a9a20bf/2299871207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28fc520-8743-4eed-866f-39d5a88f4da0/funadavedipuzotasavamubut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb175ad-4188-4a91-b562-79f423c8073a/37093624508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea0007f-48d8-4e2c-90b8-ac2e82d9f200/alkaline_herbal_medicine_free.pdfIn PDF document text
    • http://monufaro.epizy.com/62667973395.pdfIn PDF document text
    • https://67dbe094-6b68-4a2c-870f-9bd980043d88.filesusr.com/ugd/cff74a_d781456c00294c74b01734f7393fc4ca.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/36944959075.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_fff3771165904917a7bc992a7112c8e7.pdf?index=trueIn PDF document text
    • http://ferurexage.epizy.com/gevinaxovisu.pdfIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_89a1d103415a4208959fdeebc1ebcbcf.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/maytag_3000_series_dryer_belt_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78795c6e-94e9-449b-900b-81c31a9ea7f5/the_sense_of_an_ending_julian_barnes_read_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 5428 bytes
SHA-256: bb0df211c73bc659605cf9e47bb5749c8b31eec3257eff3174e34e9e0b634dde
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 12940 bytes
SHA-256: 1ee7fcfdffcffbafdda2d72bad47a8ee694403e081e1159454a45e768b6a7880
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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