Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e121d8043ce6ed…

MALICIOUS

PDF

89.4 KB Created: 2021-03-27 23:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd1f4b8f384675b9afa9179da097d332 SHA-1: aa415e285ebc27d8a520490fb4c7d0c99b5e0da8 SHA-256: f8e121d8043ce6ed2d5f4883745fe6ca003d1428115db560b749e236ed2233ba
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, characteristic of a link farm used to distribute phishing content or redirect to malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it's designed to lure users to malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://fokemale.ru/award?keyword=yasin+suresi+t%25C3%25BCrk%25C3%25A7e+okunu%25C5%259Fu+pdf PDF link annotation
    • http://natgood.space/641653990922hlbe.pdfIn PDF document text
    • http://mattelipsticks.site/darlinghurst_school_ofsted_report_20168if6e.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/d2476d6c073c.pdfIn PDF document text
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/kosokuviguverexepev.pdfIn PDF document text
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/2280f.pdfIn PDF document text
    • https://putajomarope.weebly.com/uploads/1/3/1/4/131437676/mulosiwezozejutefeki.pdfIn PDF document text
    • http://tb-films.ru/muvufegatifutubapifanef047fb.pdfIn PDF document text
    • http://esclick.pro/solving_quadratic_equations_by_factoring_quiz3e073.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/sawafixutujux.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/xubugiz.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/b44bb758.pdfIn PDF document text
    • http://fresh-ita.space/overcoming_gravity_2nd_edition_exercise_chartssfpmb.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/jupoximofom-tisoxidemafulob-dejijurabamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_b87b8823f32a44d6b68f61756725c072.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_0d6e28d5ee154c4d91c06ab176978fd2.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_2a0ee44fe83a4e6cb6d8b98d1f9cd802.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_5d2012d33f29433b878829a1b90a7dfc.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_f834539cb43a4a9283a276e1a86fc7fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/491d8231-e233-4ab2-aafe-30edad4fbd55/troy_bilt_self_propelled_mower_with_honda_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb8acba-319b-43dc-9483-4c2e9b8dc100/3912986298.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_9e5b526f6cec4699983ade3a7a41acd0.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_1729004e439c4bf294727949c379e334.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_cda81efd10684d58b02bd8bdf3670432.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3a6b9a-c29a-4e8d-b006-fcd69a1f6f91/the_prayers_of_a_righteous_man_availeth_much_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1749d836-d8fd-4265-a133-637a8d445ce0/1533326970.pdfIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_4cab88b1e68e4b4892230120e5e457b8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 5580 bytes
SHA-256: 44338fc9a3ff8a93613be80af3bed63ef6443c92875cd4f305b5e45ac7b16edf
font_01_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 13236 bytes
SHA-256: af394dc3f90fba244913da04c1fdd7545424a9eec24f50941490531ef1b09db0

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