Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2849b0b057ed775…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 23:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a91bec249cfbbc51bbba0b791a18cce SHA-1: d520768790686c71f8e897a76af19bc3b815a55a SHA-256: e2849b0b057ed7752f16599e70be22bc4793bc4768dc9a9ec33e39c6d73e5a5f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to interview questions, likely intended to trick users into clicking the embedded links.

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://druttle.ru/123?utm_term=sample+questions+for+interview+for+students PDF link annotation
    • https://cdn.sqhk.co/surikuzezun/hcGg1jc/18531170771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455916/normal_6000c17a62ace.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/1449969.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/tatadilez_zikubodogenefa_maxamup_bubusipope.pdfIn PDF document text
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/9733488.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hegcSjh/fudares.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/kipojopat_wabedotekiwa_durew_vagirexum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fc88369288ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5fd11b6e79a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5ff210cd9d589.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/TijriaI/40841749994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_60270ea6774b6.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/hiSXxhb/77694267541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601f2bd0079bd.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/SjhjbPq/fumezegesigavovidujamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_60001054090cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_6003dadd6ba9f.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/fuwawibu/95451897700.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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 5568 bytes
SHA-256: 05b248679ce9b817c5c39d5219d5bf92c7889385a5e8ac1b1263f09f4d90472f
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 10808 bytes
SHA-256: d4e2bae85f46d3ff96fb91cba40c7f07e7466b5c7cfbd7b092a1f536599c8528

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