Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4f1c8fe82972f4…

MALICIOUS

PDF

83.2 KB Created: 2021-03-19 23:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b657d9c0091b2bb22e30d09b90fdcc1 SHA-1: 5a7ef674f39032c58a3b82b0f637140b96f2690e SHA-256: ed4f1c8fe82972f4bb0db07c3fbaeb9546c0c6f1255d02d8891022fd04d51d2c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'effectiveness in business administration', likely to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/strik?utm_term=que+es+eficacia+en+administracion+de+empresas
    • https://cdn.sqhk.co/zowonefaso/jaW6gdE/negologonoset.pdf
    • https://cdn-cms.f-static.net/uploads/4378607/normal_603aea425ce14.pdf
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60145f3bd5d54.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_600f7b0109ee2.pdf
    • https://cdn-cms.f-static.net/uploads/4499351/normal_6045052285544.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_6040044d35999.pdf
    • https://cdn.sqhk.co/wepunajexiju/57hckhg/dubai_drift_2_mod_apk_rexdl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zemigiduwagafu/87780367758.pdf
    • https://s3.amazonaws.com/sowewazulejewi/are_murray_riding_mowers_any_good.pdf
    • https://s3.amazonaws.com/jolunenafobuw/xizojadi.pdf
    • https://uploads.strikinglycdn.com/files/a880c522-7672-4d72-b7a1-0b47d4503cdd/kefesubezosufuza.pdf
    • https://s3.amazonaws.com/dovulavavo/chrome_full_setup_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/7475af4a-e430-4791-8ba4-b3a50c9eedd7/whats_the_difference_between_my_cloud_and_my_cloud_home.pdf
    • https://s3.amazonaws.com/tojabixefova/liviwomimusuzik.pdf
    • https://s3.amazonaws.com/lofese/brushite_stone_formation.pdf
    • https://s3.amazonaws.com/rivazixexuguri/surface_area_of_a_cone_worksheet_tes.pdf
    • https://s3.amazonaws.com/nefomojuwet/ridikisulelemolaj.pdf
    • https://uploads.strikinglycdn.com/files/ff8bae5b-1acb-46ac-ab13-c62407f1f99d/onkyo_tx-nr709_remote_control.pdf
    • https://s3.amazonaws.com/xeruxaxer/mormon_nursery_songs.pdf
    • https://s3.amazonaws.com/kefiperizonofu/pokemon_fire_red_cheats_gba_emulator_master_code.pdf
    • https://s3.amazonaws.com/jizubisetebof/xojovizikofufuxefe.pdf
    • https://uploads.strikinglycdn.com/files/3eef3890-8fb4-4b74-a6c2-59de24b0f964/6612384734.pdf
    • https://s3.amazonaws.com/tajimipojimo/32868790199.pdf
    • https://uploads.strikinglycdn.com/files/d5ebf65b-c242-4c68-8fb4-5e1a28960b85/how_to_get_a_small_business_line_of_credit.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_off0000f906.bin
f37641d225ce02247a0d9f46b482f7c73e9ece382cb6eaf7ce20bed55a347c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 5212 bytes
font_01_sfnt_off00010aa2.bin
a0a200f806eea5fb17a638ae747bf90b833141036998f919453a97c58458b892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 11804 bytes
font_02_sfnt_off000130fc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 4324 bytes

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