Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2c3f502f0b8730…

MALICIOUS

PDF

89.0 KB Created: 2021-03-02 16:04:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6fc006c7339f23e9aa90d21c739e16a1 SHA-1: 11c59148b904434e18ced4d6a73259640231293a SHA-256: 3a2c3f502f0b8730e1c4e810e0796a30958839e57d1fb922c6c4b7e5dbdf8a4d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically highlighted as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a download, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://zajinet.ru/123?utm_term=minna+no+nihongo+1+listening+cd+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6016d842324a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/7PYiejb/29222533632.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hhhjusi/white_stripes_jolene_studio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404108/normal_5fffbb080433b.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/knRogis/scalextric_arc_air_vs_arc_pro.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/which_hand_to_wear_bracelet_for_good_luck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6019c69907943.pdfIn PDF document text
    • http://zenafek.iblogger.org/86305680456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_5fdb20f74eaf2.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/8gjdjd2/indycar_race_control.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/lg_fridge_ice_tray_wont_dump.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/2013_jeep_grand_cherokee_transmission_oil_change.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_601b72ae7facb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famifel.rf.gd/kugipivazazosiforogu.pdfIn PDF document text
    • http://nibijifituvi.epizy.com/zobofexof.pdfIn PDF document text
    • http://rawozenagi.epizy.com/amar_akbar_anthony_video_song_2018.pdfIn PDF document text
    • http://lotapit.epizy.com/pitasukazajazojanasukube.pdfIn PDF document text
    • http://lijizuzinarit.epizy.com/22059506948.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/electrochemistry_pre_lab_answers.pdfIn PDF document text
    • http://nipufafinera.epizy.com/wufakona.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/is_an_ak_47_more_powerful_than_a_ar_15.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 6520 bytes
SHA-256: 11459f98287a60e3495cbc2d5f99416f9c883dca3f4f0c5e66bae0ed1891d7c8
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 5252 bytes
SHA-256: c6f0101ebdd0d84eb125bce4f6b8d7e69cb01159e259573293c9aa9359201e18
font_02_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 2624 bytes
SHA-256: 8838aeb3afbecb32f2a8c94054830192a17c5cb86bfdadc224789ae8e8712e00
font_03_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 11648 bytes
SHA-256: ede4a5477fdb81c7ad33b4670d015681cca33d9c13f19886e86fb64a64d2403d
font_04_sfnt_off00013e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E78 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15