Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bb20ac756c36bd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 14:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 54683d0f0d925d083aa36d717539536b SHA-1: 617ff3d25a00800de35c5e0b346577fecea58921 SHA-256: 21bb20ac756c36bd408bc2511f0a0f5df1be64af94499c188a9d09be13f91b07
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, suggests a lure related to 'understanding demand worksheet answer key', which is likely a pretext to drive users to malicious URLs.

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://pelibifir.ru/wix?keyword=understanding+demand+worksheet+answer+key PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/luxep.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/rogojutotuki-jusoral-tumegog.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/QYeciaA/weluv.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/jgfieig/brain_for_monster_truck_2021.pdfIn PDF document text
    • http://pimovanurebi.22web.org/47821601.pdfIn PDF document text
    • https://cdn.sqhk.co/gujawovuk/1jcd0je/high_quality_mp3_voice_recorder_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sewoliwadumi/ia3bAxp/prank_call_wars_apk.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/gonud.pdfIn PDF document text
    • https://mosodufenu.weebly.com/uploads/1/3/4/8/134889918/9257182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_60190e3abf8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/jgjiqp9/lofetele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fe12cb65b046.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/51ad60ee2.pdfIn PDF document text
    • https://jenosexafunira.weebly.com/uploads/1/3/4/6/134686035/67577a29c201.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/c822392e2.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/rovolenalolanofipafi.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/46d08a70-a922-41ba-a40c-e49d7229a210/ratamobepuwowawuxijife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9a65c1-d9a3-4c94-a9db-7e4dd0f225d8/44753333469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfd97a9-4209-42f6-b1f4-f03ab03f6367/ps_vita_slim_cheap_price.pdfIn PDF document text
    • http://fexewagesulel.epizy.com/nonconformities_meaning_in_tamil.pdfIn PDF document text
    • http://motojanafit.epizy.com/taradokalode.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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 5456 bytes
SHA-256: e755cb3551d1c856d8555fea05c3960b3beb7e5e6527a09dc7842fa3a6166028
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 10860 bytes
SHA-256: d7adcb349ced0846cce8712bb77b0c54c64f2d5d09515d412bceafc3bb24dadd

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