Malicious PDF — malware analysis report

Static analysis result for SHA-256 d763a9747aa515cd…

MALICIOUS

PDF

78.4 KB Created: 2021-04-18 17:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d2cc3f3a937b4a1fda8a8520729e31c SHA-1: 7cae7d2e6586511943d99e5cb5252bffac9c1c44 SHA-256: d763a9747aa515cd211b5808776a4036098c3b2684a30496107efdc57a4506f1
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 point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=what+is+the+first+book+in+the+unwanteds+series
    • http://technodom11.com/sixajafedorozo0gpu1.pdf
    • http://momentshop.website/muravewedaz4c.pdf
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/4b93525.pdf
    • https://sutogeva.weebly.com/uploads/1/3/0/7/130739298/3715272.pdf
    • http://shop-onlain.fun/su_binary_file1q18p.pdf
    • http://bofajazikevag.22web.org/ariston_dishwasher_manual_lff8m132cxaus.pdf
    • http://lizubujakus.22web.org/18512762840.pdf
    • http://vakafubetax.iblogger.org/magumefajenetikafa.pdf
    • http://ketousa.site/how_to_use_black_jack_felt_adhesivehbcfv.pdf
    • http://itgermany.net/east_horsehead_lake_fishing_report8dloi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0481c507-b9cc-4a18-8616-086d776170b2/womens_black_levi_boyfriend_jeans.pdf
    • https://uploads.strikinglycdn.com/files/ad09aa4d-5359-46cf-98d0-f4515e7f569e/ruwavitadilut.pdf
    • https://uploads.strikinglycdn.com/files/659c48fa-0309-4dcb-9913-e74e8de26553/columbia_par_car_parts_australia.pdf
    • http://wofodumav.rf.gd/kofosidanuwuva.pdf
    • https://uploads.strikinglycdn.com/files/624cb562-71be-4842-9843-1caf65a881d2/41126640074.pdf
    • https://uploads.strikinglycdn.com/files/740c3e8c-c06f-4f9c-ae44-52b0c0c1a9e3/niwivulajaku.pdf
    • https://uploads.strikinglycdn.com/files/73da7eef-ea4c-4218-8dc4-eea1b3cf2d43/63189746824.pdf
    • http://meletediso.rf.gd/luruzitewefazezinele.pdf
    • https://uploads.strikinglycdn.com/files/ec0c8658-f102-4b36-bdc2-68f5946859c5/the_dark_tower_2017_movie.pdf
    • https://uploads.strikinglycdn.com/files/6e1f6608-70fb-4533-8e0e-28a5a1f1f2f5/whirlpool_wrf535smbm00_water_filter.pdf
    • http://pulupalu.epizy.com/free_business_powerpoint_templates_microsoft.pdf
    • https://uploads.strikinglycdn.com/files/80d5d87b-265d-4f85-9a38-ef69fc3e48df/radicals_review_quizlet.pdf
    • http://jolavewavesuj.epizy.com/61517478608.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_off0000e7de.bin
23436f962067f8c97b626756598f983101686586679cd6c4631c2d401706da58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 5156 bytes
font_01_sfnt_off0000f96b.bin
b87fc395f151262f9c50cabcf7e74d3d17a6ad06a6cf8e8ef70ba6563f36f448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10612 bytes
font_02_sfnt_off00011d15.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 4324 bytes

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