Malicious PDF — malware analysis report

Static analysis result for SHA-256 da70a8d250eeb8bd…

MALICIOUS

PDF

64.0 KB Created: 2020-12-01 02:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bacbb07ae02f0973b6f7196aaf6b67c6 SHA-1: c2df7de9b38783ca6c83758bafa7e945d20f47ad SHA-256: da70a8d250eeb8bd684d73d87013fd417bad5ef8ce96596d8596874baf76acdb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=ace+academy+2018+test+series+pdf
    • https://tajonerimokop.weebly.com/uploads/1/3/4/8/134879789/gukomaxefim-wibogajota-bekezatawobugu-gowowozajetada.pdf
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fb2812a87ea0.pdf
    • https://pejugegifejokub.weebly.com/uploads/1/3/4/3/134366246/kasotizipulurevuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5fa7d32d14cb7.pdf
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5faf5354e5c21.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/kemodufedafuxedif.pdf
    • https://ligetivegivug.weebly.com/uploads/1/3/4/0/134041815/6403721.pdf
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/nemudati.pdf
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f9240874c30b.pdf
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5f9343f687ffe.pdf
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vobifaz.pdf
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/dalokatotikixab_kinotezod_tilunabus_juluzedodugal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc256be61e25426e183f5b2/1606571711637/south_hadley_high_school_athletics.pdf
    • https://s3.amazonaws.com/rerinago/stages_of_venture_capital_financing.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad9b.bin
c414486c735b275d679855249621fbad8aaaff3329ca899412c5a10a5ad2a2c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9B 5880 bytes
font_01_sfnt_off0000c192.bin
b5991799467b7d0ce4198068f4222c3db4327e2d01b72d250a1fc00d515c2004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC192 2972 bytes
font_02_sfnt_off0000cda3.bin
7a40b4651c868116670daf503b482d920d7a460f0a79f303e9a403c4b5c0233d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 10624 bytes

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