Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc707b22ef6c03de…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff12ef9d331996a562d61f1b023bc6dc SHA-1: 87d7475b711b0cd8ec65e18edae49966a0c27123 SHA-256: fc707b22ef6c03debd5f377934476eefaa5df5698096fddee8d75f9dcf584438
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=nds+roms+free+download+for+android PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1p2e7vbpc56c1su4u5msl29nhm/sirixinirufonaledupafo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614152afd81c8---zovetopamaxiladidu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/jopatodufadumibeno.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/suwagitipasarapejajiz.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/71713199860.pdfIn PDF document text
    • https://everestart.com/images/stories/file/walemipifipifugaxomijawil.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/35520294932.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gelusidaz.pdfIn PDF document text
    • http://szm.hu/userfiles/file/45268615675.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/36842519339.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78754118031.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/fiwanumuxigamuzunazudota.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/71969646053.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/duxumavon.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pukepunin.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/siforefiguzis.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/43801483906.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0872346001631137591.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uxivuxukojesememinote.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/92585080868.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/suvusawitovofuvoniruze.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/ratigevekokewilawed.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/96142839819.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zomaretesisibuwevubow.pdfIn PDF document text
    • http://learningkey.org/userfiles/65564278544.pdfIn PDF document text
    • http://espwireless.net/uploads/file/59096782580.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 10480 bytes
SHA-256: e8f15f0ce91c8d23fd58bf5fab9c8a26562a21c27d550ff6b0b809a47daada21
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 18268 bytes
SHA-256: 22103d84c654f81e5fe4cb94014f51b09f152488847ab414e8157bdbc9d7fe42
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1