Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c618aebd0b56574…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 22:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7bdef54fae61a3ed805f035992157668 SHA-1: 2cd1cbf4e6a81261ee1f693c8a3ecf907d17129a SHA-256: 7c618aebd0b56574222f6ce2f4a05f9873851f0e8eba71ba7b1e4a8575fe817a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.8287

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=canada+immunization+form+pdf PDF link annotation
    • https://cdn.sqhk.co/minamojazi/bigkibM/oscar_health_plan_of_california_payment.pdfIn PDF document text
    • http://mihetos.xyz/adb_install_apk_waiting_for_device24avd.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/9hggeqR/gixidejuvirorofetobere.pdfIn PDF document text
    • http://mebelintera.ru/where_do_ethnologists_believe_the_navajos_originate_fromtf8f3.pdfIn PDF document text
    • http://damita.fun/calendar_one_day_per_pagesgd4k.pdfIn PDF document text
    • https://moxitimufetumo.weebly.com/uploads/1/3/4/0/134040580/gaxanoto_vujukakone_vasod_jexig.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/jeSqQih/puppy_wallpaper_cartoon.pdfIn PDF document text
    • http://cherrypimp.online/58076490236y7100.pdfIn PDF document text
    • http://daddytestit.xyz/line_6_pod_go_release_date_uky8aex.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/YoPCshd/86122695380.pdfIn PDF document text
    • http://philonio.online/warcraft_2_2018_movie_revenge_of_guldan_release_date7a8te.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/segowujuro_joxexasuv.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/palopojut_setalilutakaf_dudasumapime.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/bCQal9D/38914192646.pdfIn PDF document text
    • http://kawlites.online/panacea_flower_drying_crystals_instructionskj387.pdfIn PDF document text
    • http://modernstyle.pro/tolukabaloxunihfg.pdfIn PDF document text
    • http://nout-prodat.site/epson_stylus_photo_1400_maintenanceutd4a.pdfIn PDF document text
    • http://leadtop.co/3184313556429l3u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_d4d90f5685d84a59b6ce3f1d2af71be2.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_8222a9e1b68f4a27860bbc1bce49a06c.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_6419c0bd0b2344b7819d5f130617057a.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_85537fbb74d7493dba8f447646c6454a.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_49e89d5a3b9349dba17df1b19bcb823b.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_31001ff0f8744683acf3de7522bef058.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_13a42a8233bc442188619c0ca0e199ca.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 4932 bytes
SHA-256: 9c2e8cc60863a2d07652576fa356f4f14579363dfc493942ccb396b24aae6994
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10744 bytes
SHA-256: 9de5da6fc3b461ac2dcd5de3693c8e753289e7d0a87c0ab427f0db638850c6be