Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c5c9293c00e7e1…

MALICIOUS

PDF

85.2 KB Created: 2021-03-30 13:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52742b20fd658d5f7e947416d62d215 SHA-1: d3effadc6b8fc0fbde10e8ab8d5ff9929b793b84 SHA-256: d1c5c9293c00e7e15a12fb157bcc6b31c7ec4fcceb7afee73b2b74457eb0d6b9
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as potentially malicious and flagged by ClamAV. The document body, though heavily obfuscated, appears to contain text related to 'assistive listening devices' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of external URIs and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=types+of+assistive+listening+devices+pdf
    • http://tehnotop.space/798330126226h31i.pdf
    • http://tuimag.ru/the_hunger_games_mockingjay_part_1_original_motion_picture_soundtrack_brainewusu.pdf
    • http://9gusevshop.website/bukitalawer2rk.pdf
    • https://cdn.sqhk.co/lidupusumoj/jel3vja/texas_holdem_poker_offline_mod_apk.pdf
    • https://cdn.sqhk.co/wupifufexix/midgdJG/49724434464.pdf
    • https://cdn.sqhk.co/zupuguvawaj/Ughghq4/kadujipenifine.pdf
    • http://perfectiona.online/how_to_update_garmin_nuvi_maps_for_freeysz5p.pdf
    • https://cdn.sqhk.co/fosapuzisas/ifhj6gi/convert_between_metric_units_worksheet.pdf
    • http://fepafotejidug.iblogger.org/boston_visitor_map.pdf
    • http://theplafond.xyz/hbs_price_in_philippineszydar.pdf
    • https://cdn.sqhk.co/puzusagilem/oYg2EqI/euiv_brandenburg_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/45afc51d-508e-4aff-8b77-28c848e150a8/resistance_band_workouts_strength.pdf
    • https://uploads.strikinglycdn.com/files/d3e33409-8f4c-4f00-a7bc-cc0c7ed2834e/graco_snugride_30_lx_car_seat_and_stroller.pdf
    • https://s3.amazonaws.com/napisakaluja/77832444721.pdf
    • https://s3.amazonaws.com/gorajikunobixi/navy_regulations_nails.pdf
    • https://uploads.strikinglycdn.com/files/e29386d3-9d89-4699-a54c-e8dfa11aad73/jaboru.pdf
    • https://uploads.strikinglycdn.com/files/87821c36-f2d6-4cb3-9d61-368d6c78d05d/realidades_2_guided_workbook.pdf
    • http://wepirizifomonij.epizy.com/xakiwezabamadejunetodow.pdf
    • https://s3.amazonaws.com/polexebuj/40019091473.pdf
    • https://s3.amazonaws.com/jotogorurekuro/gutuvevesenelivo.pdf
    • http://muduwabu.rf.gd/joxipuxefuxifoxexuk.pdf
    • https://s3.amazonaws.com/lovomijelun/35426663391.pdf
    • https://uploads.strikinglycdn.com/files/7951e0bf-4982-4059-98fa-3f76cc88bb46/financial_peace_university_coordinator_login.pdf
    • http://gejaran.epizy.com/13583745386.pdf
    • http://getozareburi.rf.gd/samsung_a7000_firmware_free.pdf
    • https://s3.amazonaws.com/jefazaxal/tesco_pay_as_you_go_android_phones.pdf
    • https://s3.amazonaws.com/tirimofufemukat/gopizadopa.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_off00010fa6.bin
370687c05afde836a0cc1c0c20442920e4a333181aa0781a5ef27fcd3b60a1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 5340 bytes
font_01_sfnt_off000121fa.bin
c5951295e2c3071925d21aec0b6f4854492b05eccd109fdb33b01c74cacbff69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FA 10824 bytes

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