Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86eda52c78065e1…

MALICIOUS

PDF

78.2 KB Created: 2021-06-02 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a17278cb529d1e9139c6ee2d51682a41 SHA-1: 10be8d39f0470996e4ca5312c9b4da789597618c SHA-256: e86eda52c78065e1b28fbb4c817feb228c8f0f6406c0b3e60f2e346ee3c8340b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://wastran.ru/pbw?utm_term=how+many+calories+are+in+a+small+strawberry+milkshake+from+sonic PDF link annotation
    • https://poxofosu.weebly.com/uploads/1/3/4/3/134308827/8404872.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/9160164.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/df39ec3.pdfIn PDF document text
    • https://pozitolize.weebly.com/uploads/1/3/4/3/134330731/fojup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485823/normal_5ffbec7c58cf7.pdfIn PDF document text
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/sezevogufoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe369e289752.pdfIn PDF document text
    • https://dametubidino.weebly.com/uploads/1/3/1/3/131383661/1419478.pdfIn PDF document text
    • https://zulaxavon.weebly.com/uploads/1/3/2/6/132695675/bigomibefemenopawat.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/zoninu.pdfIn PDF document text
    • https://dujedagopodiku.weebly.com/uploads/1/3/4/5/134580966/muviwowu-desifegidukibo-makewetu-suledo.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/zelolopibole_vugapudifa_jerumudowuninil_zomajetufu.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/7912732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144427641/44441507535.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144511569/onn_wireless_mouse_dpi_settings.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/how_to_write_a_formal_apology_letter_to_a_client.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/rogejijilopanirosoparufe.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/go_math_grade_2_chapter_7.3.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 5480 bytes
SHA-256: 0c18358fe7fe7cfe41e1b4aaa4b160f4a5c732930b289873c842906552109392
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 10656 bytes
SHA-256: 3d489e80dbd9ff3828ff5fc090931d509d95d4ddd1f370d9814e882b62fe1438

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