Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f59cf8a4af4132c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-11 01:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31029500701e01dafd721a9c712eb87b SHA-1: d6214fd5ca2b4b95b4f65be1cc3d2b2b2aa2f191 SHA-256: 1f59cf8a4af4132ccb8bf8245e85df0ff6db254f3f5cb6114253edb3b750c2f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=megaman+legends+iso PDF link annotation
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/35247430746.pdfIn PDF document text
    • http://htygroup.com/upload/files/jukewosuwakoz.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4672618465.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/44065703385.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/17080854049.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/d3f2c83d52ccb420a44654e78d9dca57/5183001024.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/nogojojuxofunujituduxuz.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/34908248096.pdfIn PDF document text
    • http://nemochem.cn/upload/files/49288538461.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/90001233863.pdfIn PDF document text
    • http://midel.me/userfiles/file/riloradoxizire.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bigezemuvumiritugefipume.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bbhg8e7rb4mglum58g8d2jva62/54206388525.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gexokek.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/6108493866.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/menum.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///85500140054.pdfIn PDF document text
    • http://bastola.org/userfiles/file/5653597124.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/lijubimixekojuxotanamedis.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/81663780532.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/dinunolawuk.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907151020.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/magavemalanekodugubamogab.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/bepabikin.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/28361291400.pdfIn PDF document text
    • 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_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 16460 bytes
SHA-256: 122728cd03c00070bd8cd9587c0497568f31f4abb6b8c1f462218cd5b4f11273
font_02_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10384 bytes
SHA-256: 5d9dd48e9a22b095b60ce121d9ea022adfa3079f633b7b6b9b0d8ceca02aece1