Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a063a59e84d66e9…

MALICIOUS

PDF

83.0 KB Created: 2020-12-30 15:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f1340284f5170f8f6358539dc2b4bc03 SHA-1: 6a438e0ec98a35239f73e5ffaf73f4a464108b6c SHA-256: 8a063a59e84d66e9552d12c4ba8b013b067fca5f2f51c4864e2a314284ffc9cc
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://gettraff.ru/123?utm_term=justicecorps+san+diego In PDF document text
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/7445071.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/aeee59f76c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fc3444f18ccd.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/newoxexutej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5f9627eb516c6.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/pixutopevofe-wopilegat-riledapetizej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fbf5df48aa89.pdfIn PDF document text
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/05d571e.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/8590734.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/73479940996.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/go_launcher_z_prime_apk_free_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/o_saki_saki_song_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 5080 bytes
SHA-256: 2acdf84e7f08f9fb4a89f7e60f47e635514490672526b13b4c04addb79bed62f
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 11288 bytes
SHA-256: 5bf7d72d240f113996e08302ac6c249f4d94d8006b5add29ecd40bebde17ca07
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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