Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a0c1873a9f054…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 15:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c76e3407b63ef8b821a1f696bb129e9 SHA-1: 9f051cd9bb1f091d26b67a5305b482ba876e931e SHA-256: fc8a0c1873a9f0548e170e095117e1fe0089a5b8436821a16c1fdbb1ec3e076f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=computer+system+validation+fda+guidance
    • http://eeuuurrrrr.space/29633376249s3ohh.pdf
    • https://dewifekezag.weebly.com/uploads/1/3/5/3/135313931/dimolinutisilezato.pdf
    • https://cdn.sqhk.co/muvetowiripa/77Xhagi/bottom_navigation_bar_android_using_fragments.pdf
    • https://migivijebejod.weebly.com/uploads/1/3/4/0/134017877/kugilakarire-kebut-gilenowonoxodug.pdf
    • https://cdn.sqhk.co/fiwujumejuf/jimbheZ/traffic_racer_download_hack_apk.pdf
    • http://ottics.ru/ernest_holmes_science_of_mindxwuit.pdf
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/dubovimufamitewola.pdf
    • http://tesocoin.online/221209024221emut.pdf
    • http://workshop-fb.ru/english_words_with_sinhala_meaningd3hde.pdf
    • https://cdn.sqhk.co/fikalibumi/pOAXLYi/lotejiwegoze.pdf
    • http://idealica-italy.site/2006_honda_civic_lx_front_bumper_coverve8ke.pdf
    • https://cdn.sqhk.co/fevivesuxofo/gcw5Xjh/61990208782.pdf
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/nidefozeripi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gafopoxekog.epizy.com/41658103909.pdf
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_7ff913da1e424fb6af43eea7ee61c799.pdf?index=true
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_303eadb6db3f4dd5b429b67c115e81c4.pdf?index=true
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_04b0021adfbd48b9b65a244b9874a676.pdf?index=true
    • http://padepivezaw.rf.gd/1174363166.pdf
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_1a55b8d7f39f481a84faed41faa5199f.pdf?index=true
    • 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_off0000e418.bin
8580bcff1a8e07e70071b2d079fdfb9335a89003cbc0227b17feb673f164e88c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5540 bytes
font_01_sfnt_off0000f6ec.bin
8a814ca8dd4c6e8e2e36fce8e9e869d98a113a4973b371603314197203abebd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 10900 bytes
font_02_sfnt_off00011bf2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 4324 bytes

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