Malicious PDF — malware analysis report

Static analysis result for SHA-256 758ab75c2382522f…

MALICIOUS

PDF

84.0 KB Created: 2021-06-13 12:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 665759ff310c2931ecebe50612bf4819 SHA-1: 17018a6209b514c0e87175a88e4f611c34e80451 SHA-256: 758ab75c2382522f1475f32c85975fd5b98585ea46b9baa78e90f9f7b8d19242
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'pixomot.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'commercial action plan'. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

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
  • 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://pixomot.ru/pbw?utm_term=exemple+plan+d+action+commercial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414167/normal_60c0bb30b19f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_605b42b55fff2.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/vubawalitugorodadobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_6013a2ba748b3.pdfIn PDF document text
    • https://nojenekaxaxi.weebly.com/uploads/1/3/4/0/134017841/nasibukejutitop.pdfIn PDF document text
    • https://wofimokenodifi.weebly.com/uploads/1/3/5/3/135331476/besinexaw_tofoluxij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatumulilugo.pbworks.com/w/file/fetch/145223757/15238059329.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/145139940/cisco_quiz_chapter_2_answers.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/vemosezenokafiwojafowapo.pdfIn PDF document text
    • http://guwikup.pbworks.com/f/dragon_ball_z_shin_budokai_3_download_ppsspp.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/borg_rating_of_perceived_exertion_rpe_scale.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144889320/lego_ninjago_shadow_of_ronin_apk_obb.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144607707/what_are_the_steps_of_the_startup_process.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/f/one_piece_kiss_anime_dub.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/f/legodupugipasud.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/accounting_information_system_james_hall_7th_edition_free.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144592332/29950197752.pdfIn PDF document text
    • http://nimojugaf.pbworks.com/w/file/fetch/145182480/call_of_duty_apk_mod_download.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/continuous_control_with_deep_reinforcement_learning_cite.pdfIn PDF document text
    • http://dakenesemi.pbworks.com/f/gukonukepepabutifup.pdfIn PDF document text
    • http://tawifem.pbworks.com/w/file/fetch/145050213/1770803204.pdfIn 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_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 5068 bytes
SHA-256: 5ccaa0113e42420f2ac31e77424652802adb6e752497429074d8bba4e166cd6f
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 13324 bytes
SHA-256: f3a984b8c32ef07066fba9553caf31ab88554ecbf711f286568cc8446d8087e6

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