Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd81903fb5fe2adb…

MALICIOUS

PDF

80.5 KB Created: 2021-03-03 17:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0129510594f36a7c6eb3fa50543e3603 SHA-1: f74f94cafedf2490b19e2aa253853f08bc1c9655 SHA-256: bd81903fb5fe2adbc9bbca079040890d1164073801b60b46209d5b4427e4bf68
134 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used to host a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, suggests a lure related to technical specifications, aligning with a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/123?utm_term=dell+optiplex+9020+all+in+one+i7+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413126/normal_602721b8ef0eb.pdfIn PDF document text
    • http://nasolanamisajo.iblogger.org/heartache_undertale_piano_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/iamxgdU/cooking_scapes_tap_tap_restaurant.pdfIn PDF document text
    • http://ronebiwoti.22web.org/cryptocurrency_trading_investing.pdfIn PDF document text
    • http://ruxuruweluwi.iblogger.org/zixefoniwutefavar.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/2OKuPRV/joplin_mo_mall_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekife/osrs_crocodile_slayer_guide.pdfIn PDF document text
    • http://lojosikol.epizy.com/seguin_form_board_test_sample_report.pdfIn PDF document text
    • http://numorajigot.epizy.com/bofeniripegerenip.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/frame_size_guide_glasses.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/96311405474.pdfIn PDF document text
    • http://ripazek.epizy.com/berutobusazekuxadubenaki.pdfIn PDF document text
    • http://sedoguzod.rf.gd/vivusajotifimodenoguxov.pdfIn PDF document text
    • http://fesonukoropirum.rf.gd/sheet_erosion_definition_in_science.pdfIn PDF document text
    • http://rewifavad.epizy.com/audio_vision_pro_mod.pdfIn PDF document text
    • http://tuwojusedikemi.rf.gd/dry_erase_sheets_lowes.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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 5408 bytes
SHA-256: c80f9fbe65d23a0dd331bb52ffcc09f52867c86942f17c86dec74f0e02e3acbe
font_01_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 11508 bytes
SHA-256: 60d86087d287740abffba946207df8bec42d181ce1e7fae14a3fffc4f1b8e255

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