Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb66eb131072714f…

MALICIOUS

PDF

316.5 KB Created: 2021-04-10 10:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3379e4022d378af30e4b0fc9a20c178a SHA-1: 2c1f75180692e9dd838c4e9df8c4d1ced715d81b SHA-256: cb66eb131072714f05796e14e913667c42810fe2dac160fd9f2e67e881f843ee
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 embedded URL that leads 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 a book summary, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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://seumenha.ru/strik?utm_term=the+sign+of+four+summary+in+marathi PDF link annotation
    • https://jubewujug.weebly.com/uploads/1/3/4/6/134653216/mataxubunu_gipawo_gilafop.pdfIn PDF document text
    • https://rakovarirol.weebly.com/uploads/1/3/4/4/134458111/nodepafes.pdfIn PDF document text
    • https://levavago.weebly.com/uploads/1/3/5/3/135343263/relidok_wifemadosunipu_kidakumatiguti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_5ce63888e8ac4dc0933db91f791f2568.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_d153533a424a4d3685cc4b2e68b215c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/59232568599.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_3ba6e840ac6b4624a66942873a5f54cf.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_c846657a347548e1904ebe00c3539c04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomaxod/cursive_uppercase_worksheets.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_bfad6fbe54c347b8a1f6ac5c488979ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5104fa4c-9f61-4993-8347-a822dd636426/3183359093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e669c1-b741-48f4-9230-f092d2379eb7/bubble_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/learn_swedish_language.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/folding_paper_fortune_teller_template.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_27465fd5c83f4c1a9d01149ce1797a4d.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_737f07687a0e4545b0b66e326b0cc170.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/38353052355.pdfIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_5808416e29c94d5382fdae9dcb344ebf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/adobe_acrobat_reader_latest_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7d925f-3d3b-4629-be2e-02c09f972afb/49713498145.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_9df8e859694c4f7b8861a619bd413caf.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_5851e929897447c7bd61637e62e82a05.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004a36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A36C 5200 bytes
SHA-256: 178eb4dbb203ba791cf07a6cc4017e88ec487a33017ffedcf9b832d2f4b8008d
font_01_sfnt_off0004b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4FB 13800 bytes
SHA-256: 9eda925bb4bf9082b5b251b0706c2291527c6416df8c69be55af06fb8a20389c

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