Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfce69786291b369…

MALICIOUS

PDF

58.1 KB Created: 2020-12-22 23:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c63215de71a0fa8e5cb9873868a27f8e SHA-1: 6688eb0ef3f49ec5e15c50b32194fac7ae535cff SHA-256: dfce69786291b369b8dcc8cfa6cc369210c9e8312664c17cbb3cc4e7bd943312
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, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a typewriter repair manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=ibm+selectric+ii+typewriter+repair+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f94d3507b4ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8988018b48f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8c1038211db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f914549c09b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc84ddea0e24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0284ee2-043b-4d77-af41-9fad5569ace9/easy_salsa_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ebf158-e2a2-456e-a24b-c1b5a59a144a/tree_house_minecraft_jungle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ba359d-c83c-4995-a49b-6c6ec3c85f68/modern_a_drum_kits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beff91c6-52f3-4f39-ac68-413cebe83f51/fekudatelutuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/korean_embassy_riyadh_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e14acfd-4192-43a4-9ea7-b0e10a1cfc3f/heat_n_glo_sl_750tr_c_manual.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A0 5352 bytes
SHA-256: 61f6c7fca8ccc6582b14148cc413fb4534c2c7d53b378ddec075a9042cf25e69
font_01_sfnt_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 9668 bytes
SHA-256: e910595647a3fe1a4214664ea8229772052b598f9e5ddfac649598ea01a1d5f8