Malicious PDF — malware analysis report

Static analysis result for SHA-256 3368272ca66ab4f6…

MALICIOUS

PDF

84.3 KB Created: 2021-03-09 12:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1fc33397eb07fdfe433e2a4bc5b5a8d5 SHA-1: f80bbe492a4a7b9e8813a5b703c88c62f43cdff5 SHA-256: 3368272ca66ab4f661b0686afac0f7bed1760f6a47e2993c4b3f28cfc080f8e4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to lure victims to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=pineville+high+school+ky In PDF document text
    • http://ca-management.website/fesifulisuxiduweroo7cc7.pdfIn PDF document text
    • http://replyua.site/gituvofedufuruwavizot2le2.pdfIn PDF document text
    • http://segwaywheelchair.ru/functional_independence_measure_fim_espaolajra6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6026fbbacce9a.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/5371682.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/piwupi.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/baxobonizinerujik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_60290dea4a47a.pdfIn PDF document text
    • http://b4shop.icu/59680236224vyser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_600773d5c4605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_60421d5f7230c.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/photography_book_printing_uk.pdfIn PDF document text
    • http://amandeepsadyora.com/homedics_scale_instructions_sc-535_manualac9y4.pdfIn PDF document text
    • http://relejovavup.22web.org/lomefaxevawujamu.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/81103973218.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/dinilederu/skyrim_gameplay_guide.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/2021_mustang_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/vuxukawomiravelewep.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/10314945114.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/zakodex.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_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 4984 bytes
SHA-256: 8f2d9316b17edce33740618405e264a15738916e259d832ec73039018d2d38f2
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10624 bytes
SHA-256: e90ecdb0c18de8421b68f97553aafd959518b3e096c00b139bdcd0df2d9c3055

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