Malicious PDF — malware analysis report

Static analysis result for SHA-256 7572d28a8d7c5714…

MALICIOUS

PDF

73.8 KB Created: 2021-06-13 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fee7129b9ece4f86ac360eaf0232b0c SHA-1: 121a8fe3da3f2681aefcb015fba0afa921c9892b SHA-256: 7572d28a8d7c5714b5098759f6350cd6e1d92608fb4fa8ced7395abd31617af1
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs, with a primary suspicious URL being 'https://infrive.ru/pbw?utm_term=math+exercises+addition+and+subtraction'. The document body, though heavily obfuscated, suggests a lure related to 'Math exercises addition and subtraction', likely intended to deceive users into clicking the malicious link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=math+exercises+addition+and+subtraction
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/dikarawalexuji-xikodajubumevit.pdf
    • https://rofubedojatedo.weebly.com/uploads/1/3/4/5/134586725/kukat.pdf
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/a68794074bd4381.pdf
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/3226183.pdf
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/8887718.pdf
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/derikiw.pdf
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/1fe7cd41.pdf
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/visosakedu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nukosazizari.pbworks.com/f/borderlands_3_4nu_bust.pdf
    • http://vafobotigef.pbworks.com/w/file/fetch/144526581/norton_anthology_of_english_literature_table_of_contents.pdf
    • http://guvevef.pbworks.com/w/file/fetch/145162926/65389505501.pdf
    • https://uploads.strikinglycdn.com/files/2c87a982-f2da-49bf-9e15-36cfd5c87c66/gojuborogowazapu.pdf
    • http://mizelabe.pbworks.com/f/pebutaronovagen.pdf
    • http://bijinim.pbworks.com/f/98122039545.pdf
    • https://uploads.strikinglycdn.com/files/bf466002-7f0c-489c-ac47-b70ab02002e1/gomilobufaxogexa.pdf
    • https://uploads.strikinglycdn.com/files/8dbb87fc-0b70-4938-a4b1-3a92af83a196/documentary_treatment_samples.pdf
    • https://uploads.strikinglycdn.com/files/87ffec13-bab2-4f88-8f8b-9a33c6d87665/91589725373.pdf
    • https://uploads.strikinglycdn.com/files/f55c65aa-ef29-45ff-8a9f-4838771ea1df/dd_spells_list_by_level.pdf
    • http://xuwuziz.pbworks.com/w/file/fetch/144800745/doruzija.pdf
    • http://litorabi.pbworks.com/w/file/fetch/144485586/75399195360.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e214.bin
b22d5247382acc8233f2733e365881d476f8b718a252f31f4e44ec7b5b9c4559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5208 bytes
font_01_sfnt_off0000f3d1.bin
ddeaf359910517c19934e1c1443f16ef760cd9b21b8c0d139908a9bac97b4620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 11024 bytes

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