Malicious PDF — malware analysis report

Static analysis result for SHA-256 721028aa87ac3b03…

MALICIOUS

PDF

317.2 KB Created: 2021-01-11 06:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bba571faefb68c83d14624d2454759b2 SHA-1: eab9aee8057ee35c06f2d8f1d9689bf5506bd428 SHA-256: 721028aa87ac3b0346fccd3eb27b98864a458c6837c22ca726e688bda522d096
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'trafffi.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=whatever+you+do+in+word+or+deed+nkjv PDF link annotation
    • https://cdn.sqhk.co/giwumazusew/eqiwigC/yahtzee_regrets_pc_master_race.pdfIn PDF document text
    • https://site-1178541.mozfiles.com/files/1178541/84531344787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_5f934e46b0c30.pdfIn PDF document text
    • https://site-1166600.mozfiles.com/files/1166600/wifi_doesnt_work_on_my_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_5faaad892f0ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_5fb91c5526527.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/jiwotegirak_zemev.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/44688391980.pdfIn PDF document text
    • https://site-1172732.mozfiles.com/files/1172732/53040370486.pdfIn PDF document text
    • https://fexazajix.weebly.com/uploads/1/3/4/6/134669695/5145929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5feb01ecb7bed.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/19964177280.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/74de4cd.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/pen_and_paper_icon_in_outlook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_5fad9f7039d47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00049ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BA0 5108 bytes
SHA-256: 1055f506c621034117eff4be70928fe76fe09e70c3f88410f1071dbbe0dc1bfb
font_01_sfnt_off0004ad1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD1F 23060 bytes
SHA-256: ab6a577233c1e014e88f2b3394156efc220c792f8474f3e3a431717734c471c6

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