Malicious PDF — malware analysis report

Static analysis result for SHA-256 63247174f99cfec0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 18:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29c393fd5d14603f557160f523fc6f22 SHA-1: ff3d8402c84beda59f88c40267d8af21c647b997 SHA-256: 63247174f99cfec085b5ee9ecb0d545fea657a2e3cbc1f99dec0528ddf943831
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are structured as link farms. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://laborke.ru/uplcv?utm_term=how+to+see+photos+of+private+account+of+instagram PDF link annotation
    • http://dtyxbpzx.com/filespath/files/20210906110729.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069e702816---2990223950.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/19850495122.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mqamcj8rc85jjf5oc3ahsom6i2/danimegukagevawawejigoxa.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/6721449409.pdfIn PDF document text
    • https://dacola.com/upload/files/11820617964.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/9094590548.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zupej.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/jesexukadosogikisakubal.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/lubivizalozojowifuw.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/zugakusitotapa.pdfIn PDF document text
    • http://corkpotters.com/images/65597949231.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/buwukevuzabejinew.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/67594338247.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/foxugavulajazupi.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/74553710679.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fofijutinerezoxir.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/50151878144.pdfIn PDF document text
    • http://artio.pl/files/files/25895524442.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/83713282441.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/kapokumex.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/jifirite.pdfIn PDF document text
    • https://kermanrooz.com/img/files/2544061064.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/48323416127.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/5471256404.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://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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 18412 bytes
SHA-256: 3ec8a5df38c1a77bd0f8b4ce927ea1554e2d4f80f4aeab7dcd46d40d98d7a390
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 11124 bytes
SHA-256: aa382457c410302ee85528cdf996f4b818c8c9834517a7a1e22a95450ca7a476