Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73c78891f1d11d0…

MALICIOUS

PDF

115.3 KB Created: 2021-05-04 03:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7301e9532485fe6942fcbea3e90e3bdd SHA-1: 55d6b2704b652fb4f6cefd4549c6ae91fa36ff29 SHA-256: d73c78891f1d11d0390d157a2f5949ff9024b38f9886d88b9de6382f8047aa46
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 0.9989

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://jacksth.ru/strik?utm_term=fender+twin+reverb+65+reissue+dimensions PDF link annotation
    • http://boomerangoo.site/music_ringtones_storyshifterhyb6u.pdfIn PDF document text
    • http://yblda.fun/kudidi99bat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_60669b0ef3bbb.pdfIn PDF document text
    • http://mantenancie.com/aluminum_hydroxidexiggk.pdfIn PDF document text
    • http://taher-tcac.com/tamopifupifobwdsy.pdfIn PDF document text
    • http://digitalmedialit.com/football_linebacker_workout_routine69mct.pdfIn PDF document text
    • http://dalnoboyi.xyz/183931205985np2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_604f5ad71eab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fdaeab0e0551.pdfIn PDF document text
    • http://emmetrix.net/32009935968uvobv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_604401322577e.pdfIn PDF document text
    • http://reduslimitaly-official.site/129577438615b4ty.pdfIn PDF document text
    • http://tryici.xyz/308445980158zafq.pdfIn PDF document text
    • http://megantv.site/epson_workforce_wf-2540_color_inkjet_printerd5fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_603157ee7f6f6.pdfIn PDF document text
    • http://vertigoa.online/s2_white_plume_mountainsfwxx.pdfIn PDF document text
    • http://wide-take.top/kodesubofiwil788v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499629/normal_5fe9c7d02000c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_ad6d4514cd454ba2b37a926b03266219.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_134379d71b124d81b8ad7da494cf5d71.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_25373a066b734917ae6324d4e8e0a0c9.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_29975844c7864042ba773e3f15f2cdca.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_55b687dc4caa4780865988b7341294ac.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15866 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0001685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685A 5252 bytes
SHA-256: d701a9a5fc4e7f5845ab5fa6f9900005f7914295720a0122cfab9153ec8b5fe3
font_02_sfnt_off00017a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A45 14060 bytes
SHA-256: c652a563437a8b8e83007466bd3704e8197febb55f800e3805557afa2586e961
font_03_sfnt_off0001a90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A90E 16276 bytes
SHA-256: a12aad5bdfea6f646f78f8eca7fa9e832cbd43c80870019ec17b317554cb0928