Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b6cb2f388d24a…

MALICIOUS

PDF

97.7 KB Created: 2021-03-21 21:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db2d324aa4e7e59e45f270d67df1e27b SHA-1: 12218115c895f8d02c5732452a3b908f5ca99371 SHA-256: 8c3b6cb2f388d24a060a1b1809dc0cc66a15fc98fdf254c5962d857d399307a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards the file's purpose of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=argath+thadalfus+ffxiv+guide
    • http://dorightunion.com/stranded_deep_mac_freeesudt.pdf
    • http://euroshopmn.space/47083079944ukwl5.pdf
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/nipogimesiputixik.pdf
    • https://cdn.sqhk.co/zidexamuwela/eR2xuPL/rarudidabebovuba.pdf
    • http://hydrofthol.space/median_gdp_per_capita_worldllpla.pdf
    • https://cdn.sqhk.co/zubejavaxuvu/diigrif/90806926811.pdf
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/ad000.pdf
    • http://hotloveme.online/roland_barthes_5_narrative_codesl6ab6.pdf
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/f47508081aad8f.pdf
    • http://lg-supportteam.com/movie_scripts_online_screenplayseft3n.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/womeb.pdf
    • http://vikeman.iblogger.org/academic_achievement_rating_scale_questionnaire.pdf
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/1b965cb571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jolatuziguxobe.rf.gd/movoxa.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e0a4402f5d5449e08ebe56bd7c41eb9e.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_d817798b51c645fb821ba10a5e2f06ea.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_4d2b2bca57614a3f8b9a1728353c76ff.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_313e3d1b56614d139245f3036aa19eb0.pdf?index=true
    • http://kijemuf.epizy.com/32979097585.pdf
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_88485b7e9ecc4dabb853e3e39114a14f.pdf?index=true
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_8fe72fb52861440aa8799499df284bed.pdf?index=true
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_21a6e9334c7448bb8258bbe65ac6bd44.pdf?index=true
    • http://sugorotebego.epizy.com/defekufo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dac.bin
f77e362a99faf25fe6b7b55b209af5e587711864f856f6eff00087c35d67aa04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 4952 bytes
font_01_sfnt_off00012e9e.bin
7a732efc099005ef76c7deed8bd1eb6f1941fdae0516b79c4578d216c723dddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 11292 bytes
font_02_sfnt_off0001554c.bin
3978fbd61d7cc6f6c4e9c7bd1ddfbdee5d8d8a89ff0a593baae1c1f986e47916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 16220 bytes
font_03_sfnt_off00016a9c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9C 4324 bytes

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