Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b276a6ca6866c9b…

MALICIOUS

PDF

90.4 KB Created: 2021-03-22 11:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9203edd58f3bea1d9a54c46244c18151 SHA-1: 1969989adc1bd9612e7c4df85462b78aa13829ea SHA-256: 6b276a6ca6866c9bfa136a6e0b59c95516a7c7ddd56f194dff52b479df538e7f
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 0.9998

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://resalured.ru/123?utm_term=b+el+ed+form PDF link annotation
    • http://zuragaretezi.iblogger.org/xuzobajekezupozozo.pdfIn PDF document text
    • http://natomazadikomiz.iblogger.org/11981990849.pdfIn PDF document text
    • https://jidobatixinel.weebly.com/uploads/1/3/4/7/134726111/takuf-raxutamun-lisuwekuwido-vudujurupax.pdfIn PDF document text
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/9904916.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/93539036746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_ca296279330f4df58114f02d7b709de2.pdf?index=trueIn PDF document text
    • http://gogobat.epizy.com/51279982856.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_4470930317524221ad2eba3d86e1dd53.pdf?index=trueIn PDF document text
    • http://detapir.rf.gd/32297936525.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_37401eebd4654f7bbfa6e3a07bf8b5ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae39247b-c96d-46d6-8238-b6c19d7c1636/street_law_textbook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdb324d-e469-4e97-abfd-ec9d142a8fe2/how_much_does_international_mail_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c71355e-6c6f-4409-b1b2-41b2f6f7f3f2/quadra_fire_wood_stove_blower_kit.pdfIn PDF document text
    • http://wuxurutigadeva.epizy.com/wexologemadejoxegimaworev.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/3d_max_photo_frame_free.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/vlookup_hlookup.pdfIn PDF document text
    • http://wesofidufu.rf.gd/grade_7_math_integers_worksheets.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_30b477e00cce4792a19ec7b079bbfd58.pdf?index=trueIn PDF document text
    • http://sudemididesiz.epizy.com/12944383891.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_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 4712 bytes
SHA-256: 5b00a8f4ac7b5ca67617701e74ccad9471f039f8076f2cbc780de81e55e6e5a9
font_01_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 11196 bytes
SHA-256: 943a2f49fcf7ed5f7077d46d5c2beaaea00236759960228e5b057282501ec6c2

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