Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d361ab472da0fba…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 15:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e620fed1461b965c06f01212375a3a17 SHA-1: b92e1dbd1e950b51e8ac43f52c46dae6fef0664a SHA-256: 4d361ab472da0fbac32e9c27bc3b90b5c7c308f85dc95ec5b85a410fba98c596
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URLs, many hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous suspicious URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a campaign designed to redirect users to malicious content.

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://bologen.ru/strik?utm_term=how+to+schedule+roomba+600
    • https://jugotogosef.weebly.com/uploads/1/3/0/8/130814460/cc1de.pdf
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/wuzagekasa_niriban.pdf
    • http://yewes.space/genukiwumipopazopjyu7.pdf
    • http://barcaporirternet-interbank-pe.com/jinopakewadimezaxiwinosah4lxc.pdf
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/delirexapus.pdf
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/divan_punutoburewem.pdf
    • http://sesosorav.iblogger.org/akele_hum_akele_tum_recreated_ringtone.pdf
    • http://dezunanerab.iblogger.org/eureka_math_grade_1_free_worksheets.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://juruzozesema.epizy.com/poxaforageguvigo.pdf
    • http://dudufimapu.epizy.com/puvokusinibonetaruw.pdf
    • http://sakiwut.rf.gd/muzaladasijotag.pdf
    • http://zevofelajasuz.epizy.com/14067779200.pdf
    • https://s3.amazonaws.com/tikoweravisixu/53403597332.pdf
    • https://s3.amazonaws.com/ninasivol/metformin_hydrochloride_drug_class.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_off0000da60.bin
03c52aeeeb66295bc7c6b93cce22d60cec429b5bdceb5f803936b3ebb76d8b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 5396 bytes
font_01_sfnt_off0000ecba.bin
7e762b874820b82eb63ad8f76a580561e61f123735347a3229c9549d5d4455c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 11000 bytes
font_02_sfnt_off0001127f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 4324 bytes

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