Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5c9b10494e4ac5…

MALICIOUS

PDF

77.9 KB Created: 2021-06-09 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 56c51d25b527f3b0973a2afd3b08b781 SHA-1: 3cb56f848dadbcde62d6a26f7b7b2d5de09c79f4 SHA-256: 8a5c9b10494e4ac59dfeb76671cef9c40f12c9724276f8de4cad54b092a553c8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded content, though heavily obfuscated, appears to be part of a lure related to a 'Zondervan niv audio bible free'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=zondervan+niv+audio+bible+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425912/normal_600ce49acbae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_6057c751b0f06.pdfIn PDF document text
    • https://fupejudesomazi.weebly.com/uploads/1/3/4/1/134108974/laguvedej_nopiwiniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_604424a4976f9.pdfIn PDF document text
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/b2471c198108.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/dedfd68a4dd6210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_606b8bfc7dee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_604cbd327c3e3.pdfIn PDF document text
    • https://rilejaxetikisoj.weebly.com/uploads/1/3/4/3/134391290/xanabana.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/muxabu_defemakalazubij_zawuzokavaviw_pereguxomuwa.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/nisejarol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f3f367-51de-4ec5-b652-2fd4979ae1b8/26850624243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea06de84-7168-40ce-8b22-10d9a5e0a2e7/how_long_does_it_take_to_cook_brisket_at_225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e5083a-c90e-4527-b102-a7b897e34079/83847504090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10198550-908c-40d6-8039-cf42f08b37c8/22934543172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f7024b-bfab-494b-8c5e-8b96bbc100b1/juvinirijulijugodomi.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413181/38320761054.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144464787/the_secrets_of_my_life_caitlyn_jenner_portugus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c4f035-ce16-4d3b-943b-d6fc8e80edc8/surface_area_and_volume_of_triangular_prisms_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985d39ae-185f-4cdd-bbd6-1c30c3618289/how_to_convert_graco_solano_crib_to_toddler_bed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ec729b-6ad5-423b-aeed-b0d8f769c379/8522164466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9ee828-3d58-41d0-ad9c-ca7b686501ca/kazuxekubinufosogosokibo.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144413979/arapa_klavye_indirmek_istiyorum.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/besagejisidodaraxure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046627fc-c550-4170-ba14-bce2e388737d/sokujakakafutogefabu.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_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 4880 bytes
SHA-256: 004dd3e8cdf69de221f04338f17b71d0c4e9b74556e202555031cadce89082c8
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10764 bytes
SHA-256: 0ab5ca8c3005ba1cc5c1fc864d7061603a708e91d7f49d5915184fd7dd65e0d0

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