Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0a3948ca2113a2…

MALICIOUS

PDF

78.0 KB Created: 2021-01-18 17:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5179c7439b3847651d991d87df152b SHA-1: b92feba2d990c8a465433244b27b543bab82a27a SHA-256: 3a0a3948ca2113a2e1de0d2d9d14d99e8631d1af178ac7a5a42afedfae174d8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=bootstrap+template+design+tutorial
    • https://cdn.sqhk.co/mokavokaven/iuiaiiB/70594252444.pdf
    • https://site-1173505.mozfiles.com/files/1173505/nirujanogoponugedivuro.pdf
    • https://cdn.sqhk.co/xeposetuge/k3jjZwq/18119510846.pdf
    • https://site-1168144.mozfiles.com/files/1168144/halloween_day_party_near_me.pdf
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5fe35818b9b9a.pdf
    • http://waneboto.66ghz.com/sea_of_thieves_pc_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4425506/normal_6004e84399094.pdf
    • https://site-1256412.mozfiles.com/files/1256412/68184394933.pdf
    • https://site-1233125.mozfiles.com/files/1233125/pikuvurojidesinulowafifek.pdf
    • https://cdn.sqhk.co/salenasova/Ehe3pgi/weather_station_model_key.pdf
    • https://static.s123-cdn-static.com/uploads/4483589/normal_6004f5c087d14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sujemitusosida.epizy.com/60850136368.pdf
    • http://sitasuwa.epizy.com/alien_shooter_1_2_3_full.pdf
    • http://sovotovagito.epizy.com/65887606798.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/conduction_convection_and_radiation_worksheet_tes.pdf
    • http://vokulokunupada.epizy.com/jagodolozexufozo.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_off0000e61f.bin
b19b272b7760ecea25adb4bb03d37d35791ac507107124e05bdef1a7787d56e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 5208 bytes
font_01_sfnt_off0000f7ba.bin
97a506b4ed7a5d85635398d38af0e9258dac849d40f39954560451a34e5bd2f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 10716 bytes
font_02_sfnt_off00011c4f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 4324 bytes

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