Malicious PDF — malware analysis report

Static analysis result for SHA-256 169307f016b48298…

MALICIOUS

PDF

61.1 KB Created: 2021-01-20 15:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c2510bbb71ea23ed1712d7de15160acc SHA-1: fbdc14e7056286bb442aa4fbce75bb9cc3adcccd SHA-256: 169307f016b48298ea0cbf3783d9163059b4dff70fc305ba4b76de8dc0e7ac86
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, which is likely used to funnel victims to phishing or malware sites.

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
  • 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/wb?keyword=harga%20samurai%20paint%202k04 In PDF document text
    • http://vuxokiwi.22web.org/95703370165.pdfIn PDF document text
    • https://site-1203466.mozfiles.com/files/1203466/spiritfarer_walkthrough_bottom_line.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/fc44f8e.pdfIn PDF document text
    • https://runonidalebemi.weebly.com/uploads/1/3/2/6/132682230/193f3b20.pdfIn PDF document text
    • https://mobuverafawez.weebly.com/uploads/1/3/5/3/135346795/wiwapowejax.pdfIn PDF document text
    • https://site-1236926.mozfiles.com/files/1236926/50190529576.pdfIn PDF document text
    • https://xinefozi.weebly.com/uploads/1/3/0/7/130775465/862158.pdfIn PDF document text
    • https://site-1180999.mozfiles.com/files/1180999/ice_cream_shops.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/40118687532.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/2133129.pdfIn PDF document text
    • https://site-1246772.mozfiles.com/files/1246772/resume_templates_online_for_free.pdfIn PDF document text
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/316e1165da7b.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/kisimujuk/animation_movie_maker_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/bise_lahore_matric_gazette_2017.pdfIn PDF document text
    • http://dadosekim.epizy.com/performance_appraisal_comments_for_teachers.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/15352739415.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_off0000b282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB282 5496 bytes
SHA-256: a8a9d064cbc2b6ecccb49457826afeb78f541bbf49067b4349cd64a4459be577
font_01_sfnt_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 9636 bytes
SHA-256: f1d381ab24c85a5fd1003b56e594fb4aca14f97b5ffe78608dad400826580e05

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