Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf340c773a3856dd…

MALICIOUS

PDF

81.5 KB Created: 2021-04-20 13:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 54703d1eb32266de2916e76f93cc5f7c SHA-1: 4b7de44896eef5366ff55ee6587a9c45a589448c SHA-256: bf340c773a3856dd5f78583246743424d5a69f2d7982cdfe12e2b289366a75d4
96 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 an external URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'trigonometric identities formula' to entice users to click the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=trigonometric+identities+formula PDF link annotation
    • https://cdn.sqhk.co/reromiwo/DZIwgeF/feberoj.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/iarmghj/pegoxusafese.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/zukuxitapedogopeposot0ycz.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/21179846214.pdfIn PDF document text
    • http://trysucre.pro/21809308290nystb.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_600b12a06d8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_60400f4e1a67c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5ff2f0cb16bd4.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/61686135583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/65144906499.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/disaster_risk_management_process.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/b_braun_melsungen_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/gemanimorizufom.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/cricket_game_jio_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/maxafurekawokenemononudu.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/hp_laserjet_m1536dnf_specification.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/moviroxisiganezoke.pdfIn PDF document text
    • http://rabelame.atwebpages.com/42964634486.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/15165814945.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/how_much_money_is_andrew_wommack_worth.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 6544 bytes
SHA-256: 7a7d935e5fbd828a5c822e153baac356601a5ddc8f24401258e57719ad414686
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 5288 bytes
SHA-256: a08537a3eb257ef1403ef04e8fc11d3129db0cd46e615fc521d1338e597ce54c
font_02_sfnt_off00010f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7D 12588 bytes
SHA-256: 73f9e178191a1e767696ec4e4a00070f92f31ac5ce8f3f656f6877c0b3b36823

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