Malicious PDF — malware analysis report

Static analysis result for SHA-256 363c59b8bfc343cf…

MALICIOUS

PDF

99.9 KB Created: 2020-12-02 19:01:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 84f1844f006419c80301024e14847f83 SHA-1: 35564059ce61e5aa0786e1efa24485bc3e28ff0c SHA-256: 363c59b8bfc343cfe02b174de3073cb28f1ba1d1b603e9183ee98e7b0bc8d6f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body contains garbled text but the presence of URLs and the link farm heuristics strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffe.ru/aws?utm_term=cheat+droid+pro+apk+mirror PDF link annotation
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/0d96783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fbf2605d4e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5fa32ebf0e36f.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/80d2b89aad.pdfIn PDF document text
    • https://pisekubil.weebly.com/uploads/1/3/4/3/134322001/5481122.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/nitogewekarab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fa91e609f92d.pdfIn PDF document text
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/7714977.pdfIn PDF document text
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/nosiretaribedixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479916/normal_5fbc254e9f22f.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/8e9344912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f91f402e1b79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1939ac6d964583626ee44/t/5fc506983c6ccf69f3fcf7fb/1606747800826/34480641089.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4fdc5239b0722914b73e7/t/5fc583157acac6192a7e04f3/1606779670265/casa_tomada_analisis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 4960 bytes
SHA-256: d1d8277da5ceb66256005ce31bfa6a1b17dc9fd3c92ee4715c4491a2ea82c5b3
font_01_sfnt_off0001380a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 16960 bytes
SHA-256: be57fb05a8d3a72c1a9faca60db1d231cf957986f6eaaa3682c6797952a08300
font_02_sfnt_off00016d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7B 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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