Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ea8f99ccdd401…

MALICIOUS

PDF

73.7 KB Created: 2020-12-31 23:00:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 56629d0eaadee9a27bdbe1baeb295613 SHA-1: 7757636db9fd1046cac174b60e18d8f853fab9a0 SHA-256: ae0ea8f99ccdd4017055ddbdc702209b2d95cab7f7d76fcf1dde2acca7fc3e76
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The presence of a known malicious redirector URL and ClamAV detection strongly suggests malicious intent. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffmen.ru/strik?utm_term=bus+driving+simulator+games+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fb93142cf9d7.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/cb0ba01a656d.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/Gidhjia/naxeex_superhero_mod_apk_an1.pdfIn PDF document text
    • https://nabezaxe.weebly.com/uploads/1/3/4/8/134852032/fovejajararevivisebe.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/lirigaforag_rifulufuvuw_wozatevikeno_sadinofopoji.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/2328822.pdfIn PDF document text
    • https://lelidejob.weebly.com/uploads/1/3/4/6/134643066/73a42c5e6.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/duzasezatu_diselexi_wonawuxakuvita.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/kasubijugam_komilawonifed_demukikafe.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/debamijizozexo/chemistry_test_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/466f9a87-e461-43d7-87db-711b4d8ec635/local_government_code_of_the_philippines_irr.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_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 5256 bytes
SHA-256: 971c260209e73775cb52676ecaab9af3510ce42fc7efe72a0e89289c54de4527
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10452 bytes
SHA-256: 3d5d5c72ab0f7905c00465c4aebf8423dd66720cdce06c41138cce713c528cc0

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