Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10c3348e64e4f8a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-24 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60f79e89492531551c389a64bd868a03 SHA-1: 88cd0457669b6ec5bfd73946e19c5fd4b5782453 SHA-256: d10c3348e64e4f8a70534ca7cd00ebd4bba05846a5cad8b4a45c3abf4159c324
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to disposable domains, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect the user to a malicious site, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://coming-c.com/userfiles/file/pitawi.pdf In PDF document text
    • http://mayinmaunhat.com/upload/files/wifixafazunufejaxaziguzod.pdfIn PDF document text
    • https://blogsma.com/files/sozirudubizisasazevamup.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/98795172835.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/limam.pdfIn PDF document text
    • https://sapporopools.com/contents/files/zebotijapusivepitavawipi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4b5c0ce0---71032136495.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/59448452325.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/jisutoxubewowozekedizosen.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/wutafugipujarewewu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zanawojazufoxijuvowuzi.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/kipamivekijovebi.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/50794875126.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/33867095722.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/gopusisadab.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/gawajutazakotomemozapiv.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/19785961037.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/61172597006.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/vagufiwozujefukivuji.pdfIn PDF document text
    • http://usateatop.com/_upload/files/papukemaferaduliwofebezo.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/27160043985.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/fonubinamozuvepewagowar.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/norosasitepanaseteso.pdfIn PDF document text
    • https://kildevangen.dk/files/sakumerodulit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anatomy+and+physiology+textbook+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 15812 bytes
SHA-256: 66f6e5b8f9ea9a595273b961962499aeade756bf11298f06340b55c920331e60
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 11376 bytes
SHA-256: 91d81270d21bdfa6f9b47bb33d67f8a631d8de266f67fd885dfbd611f005838f