Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf6b3eb85ae1f31…

MALICIOUS

PDF

71.9 KB Created: 2021-03-15 15:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9cef5f9f8e353f6231cbcb843be69359 SHA-1: 95ee84f9364574f94149d3c39905d6194530b3bd SHA-256: 6bf6b3eb85ae1f31b03319f7203da4d85fcb426f309b7884ec1064ff5cb39ef2
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://jottigo.ru/strik?utm_term=how+to+set+the+citizen+blue+angels+watch PDF link annotation
    • http://fomijegi.mypressonline.com/how_to_connect_sony_a6000_with_iphone.pdfIn PDF document text
    • http://my-favshopc.online/bosch_dishwasher_800_series_panel_readyex3hg.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/fd558505893a459.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_60349fb079f3e.pdfIn PDF document text
    • http://winoorama.fun/kuditezovugonoxasotaxafulu72dw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_601d809a4114c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_601dd19376262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5fe053ae85358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6028bfa69579f.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/44430791638.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/lozapurud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451227/normal_5fef64e0c3ae3.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/23313.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/c92b692f-bd13-426f-aedb-d8a6ebe7dbc4/indefinite_pronouns_worksheet_grade_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e9ff39-0411-4e66-80d2-5f21f9213fe0/hp_envy_4500_cartridge_stuck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4348458a-0f9b-4021-839e-cc21166e30b4/how_to_counsel_married_couples.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 5208 bytes
SHA-256: 6dd20fd31f9f7977b89a1992dba2fc230f00b9c3e0eb2b4068ca15008234fa2f
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10772 bytes
SHA-256: d7d42ea38c47f69eaa3f2aa7001ced19a796ea67faa761831f8f79f62bbbe466

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