Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ab55a05e40e7b3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 10:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: adc947ce45d0eb608bcecdba54538ff2 SHA-1: 1dbcfb2983ddc02cd092b4134408c7e5a8dd837e SHA-256: 55ab55a05e40e7b34600d6c7bc4bcacbcc467055944992202d5d43d4c20b8bbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=messenger+apk+download+pc PDF link annotation
    • http://clinivetmadonnadirosa.eu/userfiles/files/bodenoxoli.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/52568254215.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302950d2112---xitizumop.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/28319876117.pdfIn PDF document text
    • https://podimercrm.com/img/files/75809645944.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/dusabiradojo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/69900546096.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/29471788817.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/raketunafarufivujipid.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/darujofatek.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/80082145469.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/vuzamawepogepuzapariz.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/monejer.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4aa713c23fb80eb9c581489b18c5402e/89581765319.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/73088543384.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/87965009619.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/21264018217.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/ragokorodozotirebewewivi.pdfIn PDF document text
    • http://chineseclothingonline.net/File/20962731370.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/8657231310.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/52217336233.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/63152744159.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/kadafosaluneti.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_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10672 bytes
SHA-256: 59bfb40ed9ce01414ada83e677007b0b9f70d020146d96fbaf5d74389ea375a4
font_01_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 17936 bytes
SHA-256: 37e7716e02feedb795a9100a22bf04d25c9129f3a6008bf5c5274b32ce161377

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