Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2d1a75f5a98db1…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 13:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbd7ab80cc5181800d598f117c3c2a38 SHA-1: 92f81c3863ad455c38026ae7cd58375a65c03553 SHA-256: 8c2d1a75f5a98db1861dfc7593cd405616de670468a45f3ee3b3a802e417b07d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) and the overall nature of the links point towards a phishing attempt via a malicious attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=where+can+i+download+old+movies+for+free PDF link annotation
    • http://oio.cn/uploadfiles/files/22466425710.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wunot.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/45632655672.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/dowaruve.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/nujapim.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/fixigibipobewepin.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/55358107140.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210919063302.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/92794536034.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/dozewuzebe.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/maloxatoluwodusag.pdfIn PDF document text
    • https://sitarasign.ir/data/file/foxakejoxobokezoz.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/bolififeb.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/66999470883.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/14042524211.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/jinonotagibutobuda.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/merosurunaxomagomuvepos.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/mivolunosinajiruvofi.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/14093199076.pdfIn PDF document text
    • https://contabilidadegoncalves.com/fotosempresa/files/47098893182.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/lawejofafegijobivisa.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56483165117.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/rekawajutufemomalitenamux.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/8381405309.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vepurokamerebixokujo.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/puvagizosavulaguvaw.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_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10788 bytes
SHA-256: 1cc86084c4bae646079d3d599840b672a815df86478d8efa7432d7a044cedf7a
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 17228 bytes
SHA-256: 0591f0298ecb64a2f8544fd9d0f3e3f5243626dcc9adc43471643fdad7c07f89
font_02_sfnt_off00014864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1