Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e3a40f3cf150ed…

MALICIOUS

PDF

81.6 KB Created: 2021-03-06 06:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ee21f3cc307ad27dbcc21cc98dd0774 SHA-1: c3eac0fdbc9913fd1d3a5bfc6782c5c96c7f02ce SHA-256: 71e3a40f3cf150edb4a6e0696562941b09df7d7909b4d8424aeac0c15a3a40d7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=checklist+when+buying+a+car+privately PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450883/normal_5fd8160b4f017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5fefd398463d8.pdfIn PDF document text
    • http://rameautbxy.space/370519148794pagw.pdfIn PDF document text
    • http://premiumpornclips.com/443594758845fopx.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/a_que_edad_se_puede_comenzar_a_tomar_colageno.pdfIn PDF document text
    • http://wirelessinfo.ru/zatevivedoloepiu.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/2006_bmw_330i_valve_cover_torque_specs.pdfIn PDF document text
    • http://50offit.pro/is_usyd_goodtiil9.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/75258490600upfgx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471091/normal_5fddc0c3cc998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_60162249ea392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_c68b049b3f6f43e7a0246f280b2d156f.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_15d5fe54ac3d4944b67a679607820937.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_08a24267c7704ea396b4972795099058.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8beffae-a29c-4972-a7bf-001fbf641fd4/2013_kenworth_t800_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155f2653-0cc0-47ef-8d2f-0d1413a3a1ce/rock_band_4_dlc_songs_not_showing_up.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_392dae2b4e39497aafd02a8a3692ce3e.pdf?index=trueIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_229179836a1c43d6a48da5ab86168e2f.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_75ce5ab520274edc9350349c2572a6ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/032b4992-5c3f-49cc-aad3-87213fe6145f/pretty_little_liars_book_series_summary.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_56b2fc182b3e4309a54e6b5cd8d88858.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39aba9c-f60e-46fd-aa27-ccf2be8271d5/the_god_ask_audiobook_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65326031-7fe0-4315-8cf2-6068097de531/love_story_lyrics_video_song_download.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 5560 bytes
SHA-256: b23ce7085847eaf34c9bbf5d5eb197e7c311fc62a5bff02d36baca0276a57f6f
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 10756 bytes
SHA-256: 21a95398ce316ef9f2cd292879f7ba34c21e9aee876f56f125c388e7abfc1662