Malicious PDF — malware analysis report

Static analysis result for SHA-256 653c3942ed564d7d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 13:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 18abba5464cdcca4bc87ab2eb23f43e0 SHA-1: c4c80662750d1f3cc00d76b38d7549d580b40170 SHA-256: 653c3942ed564d7df63643bf72fa92bafef4329df0b9c50d4938df63b8668328
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 0.9998

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://midufefew.ru/wix?keyword=cybertron+pc+user+manual PDF link annotation
    • https://cdn.sqhk.co/pozigafo/bihS3ih/meme_vs_rage_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/ifTgel4/how_to_delete_hidden_files_on_macbook_pro.pdfIn PDF document text
    • http://detonicufficiale.website/dawudejuvokamo07tj4.pdfIn PDF document text
    • http://differencecheats.net/figurative_language_in_a_rose_for_emg2jab.pdfIn PDF document text
    • http://cabinetshub.xyz/pablo_neruda_book_of_questions7cy0g.pdfIn PDF document text
    • http://keto-s1.com/digital_portrait_drawing_for_beginners_and_advanced_studentsxjb2u.pdfIn PDF document text
    • http://losmopaka.site/mudafalivesas4xohl.pdfIn PDF document text
    • http://meetlait.pro/lord_of_the_flies_review_questions02vks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_6bdbc9a942c840c98c9f1ca17ed3a34d.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_01a99f8028f746ae93b59c40c3c0926d.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_c9b4104a3ea349d79ef3905892d545da.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_9d82ce4674124c93a7bce8a15c41dab5.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_9c04137a994541b4a1a927b8edf31778.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_d414d7da8f064aa39df02851382fd7d5.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_a9707596559c48f8a6b581a7d04db4bd.pdf?index=trueIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_bb18e45b4b4b4c308031eba24c5fcc39.pdf?index=trueIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_3c06c5b76a4b45ab8c8050df2d9cf26b.pdf?index=trueIn PDF document text
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_9a30e54504c94888a55c9e48bb62444d.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_a109956099b6454085ea2c8fe9a58663.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_3c01d16a0787438aab79614f3b23520b.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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 5228 bytes
SHA-256: e476d4f785c6552083c0f023f29c6d8a61ec92f0d633f4375c5d8a205522e0ce
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 10984 bytes
SHA-256: 29df7bb3f019d799e881090a8f00a6df80bd7a0a3099f6428db938075de5e819