Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80cbd60a1057faf…

MALICIOUS

PDF

76.2 KB Created: 2021-02-12 00:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dc3099d9609e69949fb22548a2b127cb SHA-1: 6b31f6c4da71c3809b57751183fdc03219c94261 SHA-256: e80cbd60a1057faf9ca700951c50d8d9bb0578157427db29d5d295ed2ff00dfc
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://yafferge.ru/123?utm_term=exponent+review+coloring+worksheet+answers'. The document's structure and numerous links suggest it is part of a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=exponent+review+coloring+worksheet+answers In PDF document text
    • http://faketikus.22web.org/desojoremezubakop.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/QNr2lhd/swamp_thing_season_2_hbo_max.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_600fc7425e9d4.pdfIn PDF document text
    • http://popibiku.22web.org/85891481793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5fce503f57677.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/chHHVSe/12063584092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407086/normal_5ff448f752482.pdfIn PDF document text
    • http://tufidifegoz.66ghz.com/gademinexututesasogufon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5fed3de08b895.pdfIn PDF document text
    • http://natbeach.space/53014295764yxlfr.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/jigha9b/zabixunux.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/zOjciaK/devuvubituvola.pdfIn PDF document text
    • http://mif-smeh.space/30225816303f7sy4.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/Ihfbjbu/change_eye_color_in_photo_free.pdfIn PDF document text
    • http://luminar2-download.xyz/zabekugupowogo4vk7u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/putelekireza/android_recyclerview_without_support_library.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/42805426251.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/58550489879.pdfIn PDF document text
    • http://sakikuzugodo.rf.gd/26357490402.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5436 bytes
SHA-256: e60d9f1ccce5f71dc8f096dff447327093131a4bbd524a009073e9b0f39701d8
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 10472 bytes
SHA-256: 47030dba6c625930a77ec9247481d93b07e05e48a8d64302ba3053dc34c08651
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 17964 bytes
SHA-256: dd070b0e9ef3e7e1aad6912c5086acbb1f0ae5cd0df530d941b554ab786b728f

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