Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e26d6c5c6e8030…

MALICIOUS

PDF

174.8 KB Created: 2021-03-25 06:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fc2277b68e8e4772c6a25245282a31f SHA-1: 821ca2efa314ecadec99525dd38f021fa791c7d6 SHA-256: a9e26d6c5c6e80304eebf4f517431ccbb2d76c55f64934c5791d53172babf49a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to software manuals, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8722

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://jumiwimov.ru/award?keyword=cinema+4d+r20+manual+pdf+download
    • https://static.s123-cdn-static.com/uploads/4485309/normal_5ffaaf503aa98.pdf
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/gepekakebu.pdf
    • https://dizodedijep.weebly.com/uploads/1/3/5/3/135391654/360f8520.pdf
    • http://bowuvudofi.scienceontheweb.net/vasisaxuzenupirovelivepe.pdf
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdf
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6010a5e282078.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_60383567834f6.pdf
    • https://cdn-cms.f-static.net/uploads/4388160/normal_60478152ae2c0.pdf
    • https://static.s123-cdn-static.com/uploads/4423471/normal_6000db5f333c3.pdf
    • https://cdn-cms.f-static.net/uploads/4443824/normal_604f78d299e90.pdf
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5fef42d8c63eb.pdf
    • https://cdn.sqhk.co/xoxapivasif/dghfgcV/learn_speak_english_app_download.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_600bfcd1d6456.pdf
    • http://tuvurebomiworo.scienceontheweb.net/chromatic_scale_trumpet.pdf
    • https://cdn.sqhk.co/jezofadu/WLmdUhc/pomow.pdf
    • https://cdn.sqhk.co/tujuvemevo/2uWjeje/mesin_3d_printer_terbaik.pdf
    • https://cdn-cms.f-static.net/uploads/4474170/normal_60310466440d0.pdf
    • https://cdn.sqhk.co/posebozej/hhgdPhg/temple_run_2_online_4j.pdf
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ff37f1f2d934.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8c5e9160-ef44-4da0-9517-99df1c3f919f/craftsman_table_saw_model_113_motor_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/dbeeac61-46ce-48ac-8f3e-7944753d3898/halo_games_in_chronological_order_2017.pdf
    • https://uploads.strikinglycdn.com/files/af46c5e2-7216-458d-87df-323435da8412/tiwepifesazuzivemofu.pdf
    • http://jafixomedimun.onlinewebshop.net/imgenes_de_medios_de_transporte_terrestre_para_colorear.pdf
    • https://uploads.strikinglycdn.com/files/3279f80f-2116-401a-8d7b-2e95cddccff8/wisowilibanupopafugogogux.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000285dd.bin
d747aeadcb90a11ad4ef687ca738365281e2e4667220a0a6f30f6429d8d4806b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x285DD 20528 bytes
font_00_sfnt_off00024a5a.bin
0640c3186e7bf05185c75e40403ea27d3087dfa6e7857458b4030dad9dc0e794
pdf-font-stream PDF embedded font (sfnt) at offset 0x24A5A 5288 bytes
font_01_sfnt_off00025c45.bin
766d04c381c487fbadc8220b88218795275d2417f076ae63ec049ba3ef0d59e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x25C45 12364 bytes
font_03_sfnt_off0002a7e3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A7E3 4324 bytes