Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ad597aaa8bfca6…

MALICIOUS

PDF

76.0 KB Created: 2021-04-12 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ccbb8482edcc2e867b244dcae33e2585 SHA-1: cc80b7666a698ed727e6280a473e46e3bda49451 SHA-256: 77ad597aaa8bfca6c778b4cdb5d340268d44249918d607114988890211a6e5eb
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 0.9991

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://mezovuduw.ru/strik?utm_term=keeping+skills+sharp+grade+7 PDF link annotation
    • http://compte-cmbretagne.best/codigo_de_control_universal_rcacbpgi.pdfIn PDF document text
    • http://raisinshub.pro/printable_paper_plate_clock_templateov67l.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/26770567549gd00m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5ffb344b79b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_602de3370c884.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/dakomaludarewalebun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5fffb48b221d2.pdfIn PDF document text
    • http://xuxikanewojolaj.22web.org/anomalias_eritrocitarios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_601283b74819d.pdfIn PDF document text
    • http://rkconstructionsucks.com/fogitebutekijfz2b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/elica_chimney_operating_manual.pdfIn PDF document text
    • http://godutugogusapa.rf.gd/paxesutojo.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_32e82f0721d7462eaa1c595f4bb7d2bd.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_4cde195d0d7c4fc5a80395e7d7a5c023.pdf?index=trueIn PDF document text
    • http://zabezotep.epizy.com/93425311893.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_dca495cc15224d0fae9ac71076a6da3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/what_is_the_strongest_acid.pdfIn PDF document text
    • http://puwagof.rf.gd/angular_formarray_add_control.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/pakagonirizuzuzanaxemim.pdfIn PDF document text
    • https://d12d056d-c16f-42d2-bb36-b12dbd13f8e5.filesusr.com/ugd/a2005d_da789f0e21824257b1660836ba24c4f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/rupuzuwebikagogiwejedariv.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_a01d03f668f04968961acf86772f1633.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/saxon_math_course_2_assessments.pdfIn PDF document text
    • http://ferurexage.epizy.com/tofesijes.pdfIn PDF document text
    • http://nimetegukixiz.rf.gd/disunoxuwixuxujigikisaram.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_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 5336 bytes
SHA-256: 6f5c825ae1944ca8d5a98158d9e47874dbe9bea3a7759ee0d22a09cae9b51ef3
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 11404 bytes
SHA-256: d3c54118b1ef8fd980787b9fb6b90bdd3ade30f048ccf1936bd2b21a78623b04

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