Malicious PDF — malware analysis report

Static analysis result for SHA-256 aece354c70d76091…

MALICIOUS

PDF

83.5 KB Created: 2021-04-03 21:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f91f8ac094931d1a523437d0a78fb74c SHA-1: 57f6ec6443bd41cd45a5fc73bda06ed707bbf8ff SHA-256: aece354c70d76091d461ab2d27d423e8e04eefb968e954d999aaba6ea4ba2b0f
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://pelibifir.ru/123?utm_term=you+are+the+reason+lyrics+pdf PDF link annotation
    • http://fuxezaboxekave.scienceontheweb.net/twinkle_twinkle_poem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_601fc9b0da9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_600d993d669a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_604d815d013c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_60639f266ebc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fe12106302e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_603abc361a251.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/lelafuletupusubomixuja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5feb9fbeeee21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_602d633292cfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_5fe801dd12692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_604634767b418.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/tubenofatuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_6039fa617e479.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/4642456f-2cbc-419c-af9c-6c03edf8847d/dell_e6410_video_drivers_windows_7_64-bit.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_9778df62686f4693a2a243b29e991d71.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_9e4d8cc29c724b38a125803eda5a21ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e2aa67-f285-4c94-9f1b-68a27e1a594c/53343497813.pdfIn PDF document text
    • http://bujijawuta.atwebpages.com/battling_boy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b642376c-2dec-4f44-a2d9-855b88deba6f/37346845833.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_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 5308 bytes
SHA-256: b43ebca5400eddd3595c0609b9faf55bf11523df864527e4c5378e8579fbe617
font_01_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 11020 bytes
SHA-256: cee87c786fe23c4e36c0e6742e12c399bd6f7f765bd7f37efba47778f5e97326

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