Malicious PDF — malware analysis report

Static analysis result for SHA-256 799f3c8a60d6222d…

MALICIOUS

PDF

83.7 KB Created: 2021-03-21 10:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 432db97ed4bdb6c052543d39d8417e8a SHA-1: 1000fe3215bc5aacbd94649b6dbce87acc3a01ab SHA-256: 799f3c8a60d6222da1020068e3c02dec4e07b922cf11806f13fc5cc24a8b50ed
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/award?keyword=chasing+cars+lyrics+pdf PDF link annotation
    • http://magazinrf.xyz/364604718065j3da.pdfIn PDF document text
    • http://natlab.ru/gofewotucg8b.pdfIn PDF document text
    • http://fitokaps.xyz/198024746765deik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5feb6c5b5d283.pdfIn PDF document text
    • http://invitesistem.ru/hunter_dps_wowheadt37q7.pdfIn PDF document text
    • http://joy-todays.online/771549350816vbwx.pdfIn PDF document text
    • http://the-english-temple.com/daxafagagekufarijakabawohpc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_60418367390cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5ff62a779ace4.pdfIn PDF document text
    • http://wisecreditscore.info/is_civil_disobedience_effective_essaybs1cj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_603a7b3ade030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60312d2c1eee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412377/normal_5feed3ef015aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_2fa922a2cc9d44cdbe96e71063f1ec67.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_e8c7bc0a7d15419d9d6fa25e8bd178a3.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_3372f58fd7f249a9ae6abba268cf74ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/dakifopovalebojolaselid.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/blocky_highway_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/53460589336.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_7d82e58836ac419bae7c6c8fa68db12e.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_164abff70937443db54db9977141c891.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000116e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116E9 23736 bytes
SHA-256: 00f9ab41aade6734f6a241502ee7c12b38879aa6b8fc3ec400d061974620376d
font_00_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 5424 bytes
SHA-256: 4e7ce5595a92f6e6a617154cd895044c2b59ba03c21d8dedc55a2c7ba615ecdf
font_01_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 11772 bytes
SHA-256: 9ad2447a896188882b1dc4d585fc18813da0ecb3e2094395e2e849e898e7e8cc

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