Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b70840c720f34a3…

MALICIOUS

PDF

75.9 KB Created: 2021-06-06 23:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae03169388d02b63bf4ff89aed6b272b SHA-1: 66c6e7b56bff5256d9999aac9ccb7f99a9bbfa50 SHA-256: 1b70840c720f34a313eb0e3df7faf7a09dc7453c19031783a8f4c529f303d4f8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a high concentration on disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, contains a title that could be a lure. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to potentially harmful content.

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://oniceh.ru/pbw?utm_term=why+was+the+temple+in+jerusalem+so+important PDF link annotation
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/1023346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_6036d501da109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5fdb9dd33638d.pdfIn PDF document text
    • https://genepuxomo.weebly.com/uploads/1/3/6/0/136053587/mimere-lebukuremetew-zewivedolujake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_6023035641ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_6010d389ab5cb.pdfIn PDF document text
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/943632.pdfIn PDF document text
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/9955903.pdfIn PDF document text
    • https://xenapake.weebly.com/uploads/1/3/4/3/134353424/5fff4c4f02a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_600e070a15710.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/geriwejirad.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/84e6304.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/mumajomujumos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5fed1c6f404e7.pdfIn PDF document text
    • https://pixofanipadolu.weebly.com/uploads/1/3/5/3/135326367/9488868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501380/normal_6027d755e10b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144508677/74500417197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298544be-422d-466a-861d-463cebe20800/why_should_teachers_use_data_to_drive_instruction.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/w/file/fetch/144457995/bluebeam_2017_serial_number_and_product_key_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1723e3-7fc9-43d2-a9da-f67687d3a6aa/dr_bertha_medina_daughter.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5344 bytes
SHA-256: 5302d948a012b1eb6e20cc4ce1b2e30f150d6c2b98be36cdb7320df35e456f37
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 10384 bytes
SHA-256: 316997682026bc7596b0b4d915f6b1509ecaa52d9316b4845610c637e3e3844f

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