Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9cefcbd2d70c65…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08242eb9e9a559e33a6b19b2f3aeb6b6 SHA-1: e62a48480f3aaa88a3125c59f3b7737f96056412 SHA-256: 0b9cefcbd2d70c65a59a20d68e6a59ede512f81779fffc2712153ef0a5e38bdb
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 external URLs, with one prominent URL being `https://fokemale.ru/123?utm_term=patient+satisfaction+survey+template+word`, suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains text related to a patient satisfaction survey, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fokemale.ru/123?utm_term=patient+satisfaction+survey+template+word
    • https://cdn-cms.f-static.net/uploads/4482027/normal_6055bc6321bb4.pdf
    • https://cdn.sqhk.co/tubozejo/hdfihDM/victoria_sponge_cake_recipe_with_baking_powder.pdf
    • https://cdn-cms.f-static.net/uploads/4445869/normal_6053c13d69fd6.pdf
    • http://paxezot.getenjoyment.net/66408418954.pdf
    • https://static.s123-cdn-static.com/uploads/4450502/normal_5fdf7ee1f3f04.pdf
    • https://cdn.sqhk.co/bugolajoxodu/YGQXdGL/bufotenaxi.pdf
    • https://cdn-cms.f-static.net/uploads/4421335/normal_6041a53f8d1ea.pdf
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fde08d821809.pdf
    • http://sujolisake.medianewsonline.com/cracking_the_pm_interview.pdf
    • https://cdn-cms.f-static.net/uploads/4495846/normal_602d787e34326.pdf
    • https://static.s123-cdn-static.com/uploads/4506131/normal_6000838ee0b49.pdf
    • https://cdn.sqhk.co/felebamifuk/el6VEGH/iphone_speaker_volume_booster_app.pdf
    • https://cdn.sqhk.co/laratakidev/dnijUij/buckwheat_pancake_recipe_dairy_free.pdf
    • https://cdn-cms.f-static.net/uploads/4472204/normal_603953a956488.pdf
    • http://tiwimifozukimu.medianewsonline.com/botany_2nd_year_notes.pdf
    • https://cdn.sqhk.co/nurijodefa/LhihNje/destiny_2_catalyst_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ff25d5763c25.pdf
    • http://tudejeseruleku.iblogger.org/28342476841.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://potunivezu.epizy.com/fiverijikatopogoman.pdf
    • https://s3.amazonaws.com/tuxexi/sairat_jhala_ji.pdf
    • http://kojawuze.epizy.com/grammar_exercises_for_grade_5.pdf
    • https://s3.amazonaws.com/fukepez/66970566758.pdf
    • http://guvamimifufirar.rf.gd/gukesuxewarano.pdf
    • https://s3.amazonaws.com/likerajatob/28043306202.pdf
    • http://lesidiwajenowil.myartsonline.com/51667350454.pdf
    • https://s3.amazonaws.com/zamuriza/beep_test_form.pdf
    • http://tuvugerij.rf.gd/43101489537.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001013e.bin
50aa5e072367a42483a2b25369be52fd2af52b585db949c64def822251f32ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 5556 bytes
font_01_sfnt_off0001142c.bin
aaef222333744a2e19d6c07019e8d9413e22f614091f2ee0e654278855c65b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 11100 bytes

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