Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d07eb7ec469c2e1…

MALICIOUS

PDF

82.5 KB Created: 2021-06-01 06:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3f36f1fd783eccf90a2280c690b7af23 SHA-1: 1b66c1a00928b92617fd5a71507bf605bc8563fe SHA-256: 4d07eb7ec469c2e1079d41e65d97676874c00af1b11b8193199f0f5ddfe62440
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an external URI pointing to 'infrive.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains keywords related to a piano arrangement PDF, suggesting a lure. No scripts were extracted, but the PDF structure and heuristics indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/pbw?utm_term=great+is+thy+faithfulness+piano+arrangement+pdf PDF link annotation
    • https://wesamirovajep.weebly.com/uploads/1/3/5/3/135383051/60ed140e10d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_6035f744aa3ea.pdfIn PDF document text
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/gamire.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/8189628.pdfIn PDF document text
    • https://nalakipivexovob.weebly.com/uploads/1/3/4/3/134385055/mowitusegeleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6053028beaf3c.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/5d1fb556-adc9-4620-8f62-482c7a6ad6b1/bexamomisugakivibekuw.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/vulokosumafadit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0e7487-60d6-42ec-bdbc-f9eb900233a1/kusavogepax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894b4cac-0e8b-45b6-adfe-045fed28d5a8/are_hiit_workouts_better_than_cardio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db65d5f2-4131-4efe-a16e-6fb97671b7b5/58450734997.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/w/file/fetch/144439686/dls_19_all_team_original_logo.zip_file_download.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144441186/vunewakififed.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/how_to_change_your_voicemail_password_on_iphone_xr.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144443586/zaxabusigokutogav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d137603a-453c-48fc-8699-8b33e4228f20/common_mistakes_spanish_speakers_make_in_english_pronunciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee1c841-ba4e-439e-92a6-40e8a4ed798b/zopirepiguxede.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418521/consider_the_lilies_of_the_field_piano_solo_sheet_music.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144438558/hermite_interpolation_formula_derivation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 11168 bytes
SHA-256: 5dca516028d8c78e57326b0ce70343e77554ca450644b395c6011a161e3ec549
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 5588 bytes
SHA-256: a3888540537aacbddde36bc1015f570669942020e04c557b66821e777899d530
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 11128 bytes
SHA-256: 2b4a080c8bd850594e7651741015169768f2fd501ec3a5ef0cfdc33c0e688f3d

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