Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6c205dfdc136e1…

MALICIOUS

PDF

92.9 KB Created: 2021-03-05 08:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11c06be86684124ea249656a1ad42c04 SHA-1: 3efe2f3d2a1a74284d493233cbd61e82653ab7da SHA-256: fe6c205dfdc136e18c8e72aaff26c440d90ac39689e674daf6b5adcdea26b0f9
186 Risk Score

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 0.9997

Heuristics 6

  • 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 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://midufefew.ru/wix?keyword=5.4+analyzing+graphs+of+polynomial+functions+worksheet+answers PDF link annotation
    • https://pagiburefi.weebly.com/uploads/1/3/4/1/134108706/4026456.pdfIn PDF document text
    • https://jefabulovonaju.weebly.com/uploads/1/3/1/4/131438419/biwixulixivu.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/wabopufaro.pdfIn PDF document text
    • http://whysmall.space/discrete_time_signal_processing_2nd_edition_solution_manualevj49.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/vuvol.pdfIn PDF document text
    • http://cabinetshq.xyz/diary_of_a_wimpy_kid_deep_end_lexile_levelgrr1e.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/how_to_connect_my_bose_subwoofer_to_my_soundbar.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/99807.pdfIn PDF document text
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/53349faf.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/e26bbc2eec4b7.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/vedaxijedobelat.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/sazasogume_fagenasuneni.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/beiaa4g/adderall_xr_coupon_shire.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/jf7hfVh/nofenivukurolog.pdfIn PDF document text
    • http://milanomoda.site/hallelujah_sheet_music_violadhgqh.pdfIn PDF document text
    • http://leledup.mypressonline.com/hp_elitebook_2760p_drivers_windows_10_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 5888 bytes
SHA-256: e5fba30cc81b65461ec712e6217fbf2847aae95a1156da59c387f8d88f27088e
font_01_sfnt_off000127d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D4 12656 bytes
SHA-256: ed866c171c1f700ccbe2c64b8a2d80e99ec9cdcc51cdcfc628e5ff9a1298916c
font_02_sfnt_off000150ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AC 16112 bytes
SHA-256: 304b01acf1c70644712d7cb6faef85aa6aa8fd1811786552c8c79b53818ac44b

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