Malicious PDF — malware analysis report

Static analysis result for SHA-256 da47c33f306dee48…

MALICIOUS

PDF

77.4 KB Created: 2021-06-04 23:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 004e058229f59df37d9ff9fc7c171b00 SHA-1: b172225a3f7f8d6c905c9edd995ba29ccc18e696 SHA-256: da47c33f306dee48705d156e0faa603c2e7c5bd91b78769928d15af1cf508fe0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests the document's primary purpose is to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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 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.
  • 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://baarspo.ru/123?utm_term=hq+answer+bot PDF link annotation
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/funadaribu_xazofuvevab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe50d64ec28c.pdfIn PDF document text
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/1577967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_603460ea617c1.pdfIn PDF document text
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/7991aab5b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5fd03abd7673a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60607ab37c71a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_604d17a789a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_6020c430aa3a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fe2ef59425c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_606dfe7bf2ed8.pdfIn PDF document text
    • https://mudepazenanaj.weebly.com/uploads/1/3/4/7/134765609/gumivuka.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/03b57638-849c-4c02-b69c-ac7bd24591e4/software_development_jobs_entry_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53170302-45ca-428b-99e8-09bb2f1a1aca/how_to_add_perspective_lines_in_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d913d312-8e7f-4826-a74e-61b42c28e4ca/7772782687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e75231d-bb83-4905-84af-26d940bf5ed4/nunebeviladobopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6d4e6f-fea3-4e84-be88-9ddee47f267e/genie_sp99_remote_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3b0c47-4ff1-4312-bee4-1d676ba8a7e4/78718446518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1eaba12-e606-4aa2-b528-d56a37992aa2/assassins_musical_libretto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a24170-95b8-43c4-9380-d57dfbc60ec0/cooking_wild_rice_in_power_pressure_cooker_xl.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 4968 bytes
SHA-256: 7aba7727f974eec2f78322af320ec96eac00fcfd19d1e23588a80098b6276c2b
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11440 bytes
SHA-256: bb862dd103c10cfd74d1e9421d391ab21331af66f5c8251b5daa0234021ed643

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