Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aab5a9a1dc3a3f8…

MALICIOUS

PDF

85.7 KB Created: 2021-03-14 00:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1aa77ee2adace0fdbaeb420f2e39a0 SHA-1: 75a03a0cbf2fad1951f8c4aef2f7df00210525d1 SHA-256: 1aab5a9a1dc3a3f802560e615d916c39b53e1d765c158ecfd014eaa47aa1866a
104 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF URI pointing to a suspicious URL, combined with a heuristic for a visual download button, suggests a phishing or social engineering attack. The embedded URL likely leads to a second-stage payload, potentially a Trojan as indicated by the ClamAV detection name.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://jacksth.ru/award?keyword=entrepreneurship+books+pdf+free+download
    • https://wanowozuvigamo.weebly.com/uploads/1/3/0/7/130738859/6152617.pdf
    • https://cdn.sqhk.co/pedidagow/cwicfjd/91052329717.pdf
    • https://cdn.sqhk.co/mofipife/diihb8J/cosmic_elegy_meaning_in_telugu.pdf
    • http://bobujopolodusol.mygamesonline.org/abdomen_anatomy_atlas.pdf
    • http://czecheducation.space/49764642113lilur.pdf
    • https://cdn.sqhk.co/nanijamu/hjVhfij/city_builder_games_pc_2020.pdf
    • https://gafibuludumogid.weebly.com/uploads/1/3/1/4/131453415/5e6d6e2057f0d6e.pdf
    • http://tokexal.medianewsonline.com/surface_area_of_a_triangular_prism_worksheet_grade_6.pdf
    • http://clipshd.design/36594745123yna99.pdf
    • https://cdn.sqhk.co/gijesali/3egfQgi/galaxy_sky_shooting_game_online_play.pdf
    • https://dolafodapeke.weebly.com/uploads/1/3/4/7/134705679/7084360.pdf
    • http://7lessons.website/free_printable_goal_setting_worksheets_for_studentsgw5ui.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_602c5900421cb.pdf
    • https://cdn.sqhk.co/datawafag/hjihsgd/murunelujavavujumukosow.pdf
    • http://kakorixow.mygamesonline.org/the_storm_kings_thunder.pdf
    • https://cdn-cms.f-static.net/uploads/4422894/normal_601f9de5e5b6f.pdf
    • http://jedusajinud.mygamesonline.org/13872352559.pdf
    • http://ezfix.asia/guess_the_song_80_s_hits_answerscj077.pdf
    • http://ferafukapawap.scienceontheweb.net/tadutufirosigasegepakuze.pdf
    • http://rasprodavaika.ru/bifumidixuxs4f7a.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60241aec58467.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/0ddacd910.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://diwavubodinaroj.myartsonline.com/garmin_drivesmart_55_lmt-d.pdf
    • http://dezinolabebosod.atwebpages.com/fire_resistance_design_manual.pdf
    • http://luxupovokajaf.onlinewebshop.net/important_current_affairs_of_june_2020.pdf
    • http://furipurisebete.onlinewebshop.net/iata_alphabet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010262.bin
755275c1fe65c126b6182bd1b5e89429da2181ac8b135b3ca7f77d3c7bad0977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 5264 bytes
font_01_sfnt_off0001143f.bin
36e4eb35f54fb63f3c6ade723157442cd1dc68b6b5d1aa907fc6967b62a7d83c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 10808 bytes
font_02_sfnt_off00013922.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 4324 bytes

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