Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3a61467a7cd3a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-11 06:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ba1df47f1783f9b0e52757f1a1420986 SHA-1: 4d84716e8967a083b1d94a88a9081604dfa45554 SHA-256: f1c3a61467a7cd3af84501509226ce1d82b00a6fd713553954c41a58b2d6f8c5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=chapter+8+an+introduction+to+metabolism+answer+key+pdf PDF link annotation
    • http://websporizle4.com/what_is_the_best_obd2_diagnostic_toolm70yb.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/njfrJW2/open_camera_pro_apk_latest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_601b46c5c14b5.pdfIn PDF document text
    • http://lazadacostumercenter.com/scratch_ubuntu_18._04fnm3w.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/jc5hara/sony_srs-_xb12_mini_bluetooth_speaker.pdfIn PDF document text
    • http://bunnygummy.ru/mifuwololabv7tbb.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/hghigeh/game_green_farm_3_hack_android.pdfIn PDF document text
    • http://irisca.online/what_is_the_best_place_to_store_flammable_and_combustible_liquidss02x6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374181/normal_5ff6941e8e6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476010/normal_5fed14c5b5bed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_e728d73fbab149458fe0502d31196748.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_397dc732c2464a0db3f1d825c6c6a007.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_90159bf6f5a94d3a8f00f55dbd15d644.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/parallel_lines_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/19841542139.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_b6cae15d33a645248bb572b22595904f.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_4e0543e74c484fc0ba4f6d941ea1224b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/likumidokobivusisugikejuj.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_b1c17446e18a47e994a4b9a7950e2fa0.pdf?index=trueIn 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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5892 bytes
SHA-256: 6b1e3338ad7f3a7d5c002f431afc2fef564844196e432ea9cc067853811e9eca
font_01_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10900 bytes
SHA-256: 748ae870ee07f9dd09fb75a4ac32ad3cdb21bee3201974b239f6c06720f34feb
font_02_sfnt_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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