Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd71573385f50e7…

MALICIOUS

PDF

78.8 KB Created: 2021-03-13 23:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c14e024144834f88b7aaf87d29cb9949 SHA-1: 94a1868200cb3442ecb90550b06e77c4ddaf092f SHA-256: 7cd71573385f50e74825bcf8a4a3cc24ea25e0b1506bb28ef757d934dc493166
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 0.9997

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://nipisod.ru/wix?keyword=cats+hacked+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367283/normal_600363a7232c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_60104a01b52a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366308/normal_5fcc5b1017c89.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/23369900334v8zf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_60172f3e17cd2.pdfIn PDF document text
    • http://rodina38.ru/bilging_and_permeability1zu56.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/2099091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_6027f98e66f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488556/normal_5fc5d3998f13f.pdfIn PDF document text
    • http://idclick.cash/bexelinor9oa7.pdfIn PDF document text
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/6517355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_601e75ca80e6a.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/9785119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5fd9252495181.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/c0a75d8f-abb4-494a-85a8-77210eceb8f6/53416250849.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_427b185edb9e457d8404ed887724c8e5.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_cadd84ee53504004b26782c7e118ab33.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_7b9c47cab5b346139d6e36977a5cbf05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/994eb361-d724-4707-be4e-a9335c92f64b/ionic_and_covalent_nomenclature_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5ff3f3-f294-485e-88fa-32237756ba57/44719785616.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_df6cd17acf0647f887edbd45965265c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbff96f-58b1-4ab5-b70c-b2f4bac48583/how_much_is_sears_worth.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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5004 bytes
SHA-256: 150bbfd941b098dd80e3d322d3fda58d3a67986cc3035320e310bd763a3a59ba
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10452 bytes
SHA-256: 00c39f448cacfc7344eb6f7172164eb7fd19dbf83f81dcdfc91f83ca177ba4b5

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