Malicious PDF — malware analysis report

Static analysis result for SHA-256 37adf21358611bf9…

MALICIOUS

PDF

65.3 KB Created: 2021-06-01 23:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a0f5bddef1f5c05b291ba6a47ef2126 SHA-1: aaea4348b513cb8ffe15ade500f8121cc921b207 SHA-256: 37adf21358611bf911190894e2037584fcbecc9b9d0c39d393b2ce9fc5ae5c27
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('queure.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable hosting, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9085

Heuristics 4

  • 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
  • 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://queure.ru/pbw?utm_term=is+protection+better+than+blast+protection
    • https://cdn-cms.f-static.net/uploads/4380228/normal_60518ee6bbb01.pdf
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/lelositibotegol_dazuj_bikirovowarasu.pdf
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/152c36eeba9.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/cdb1b16cf6.pdf
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/68c5cd59b38.pdf
    • https://static.s123-cdn-static-d.com/uploads/4411944/normal_60aff5f2502ad.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/513ad.pdf
    • https://nusaniwufozeg.weebly.com/uploads/1/3/4/7/134751508/sezuzanevoses.pdf
    • https://xodozevonewoze.weebly.com/uploads/1/3/1/3/131384462/c29926e2.pdf
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/xameteboposuromol.pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/393881.pdf
    • https://static.s123-cdn-static.com/uploads/4447087/normal_5ff20a84b332a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92caeac1-0799-4767-9e4f-5633a83dd8c0/fiputonajutenuxolijiwopo.pdf
    • https://uploads.strikinglycdn.com/files/c44eda97-e70f-490f-9bce-c07e8f2d2154/40834363399.pdf
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413889/what_is_code_of_conduct_in_business_ethics.pdf
    • http://wemekojezum.pbworks.com/f/54437082311.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144427920/sram_red_etap_crank_installation.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144414945/tokoregufiwopukitodezufas.pdf
    • https://uploads.strikinglycdn.com/files/69c62a19-bebb-4dcd-8e42-b11536e01bad/lajigepepoloxaga.pdf
    • https://uploads.strikinglycdn.com/files/64bb1188-a97a-4c8f-a91c-40a1c62ad670/56337913268.pdf
    • https://uploads.strikinglycdn.com/files/e78dac0a-7f44-4c24-a6d1-e7e013fa727f/.pdf
    • http://giwupiraride.pbworks.com/w/file/fetch/144475320/ghost_recon_breakpoint_crossplay_stadia.pdf
    • http://wiwedano.pbworks.com/f/how_to_put_hook_on_rod_stardew_valley_switch.pdf
    • http://negovijalulu.pbworks.com/f/43454171264.pdf
    • http://rugewenuzed.pbworks.com/f/12147036477.pdf
    • http://garigor.pbworks.com/f/mugasanipapogax.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f580.bin
0efed4ae54b6c9b192b0cace17f16f429fe36c6263be275d92984b725da79d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 5100 bytes

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