Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07de35ea0bf4cb5…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 22:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d6b3a112ca6028a6b76abc65cc2acf7 SHA-1: 916fb883d880a049646758e70baf2f338c3fe321 SHA-256: a07de35ea0bf4cb5ef35b70239e031ba9ebc98d267bff810cdbd9bbf042f0558
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://lozipotod.ru/award?keyword=aptitude+exam+papers+pdf PDF link annotation
    • https://nasokeluvofof.weebly.com/uploads/1/3/1/4/131453401/kunozunebokin.pdfIn PDF document text
    • https://dovasivenumi.weebly.com/uploads/1/3/5/9/135965427/89374b8cc.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/9905198.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/fd5ec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_606a24ef60dc1.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/attitude_is_everything_book_in_gujarati_download.pdfIn PDF document text
    • http://nijalatol.mypressonline.com/45969838863.pdfIn PDF document text
    • http://ijmalan.xyz/88083667223ygtn0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_60138c87f1cd4.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/towejaw-tejowimaxevelu.pdfIn PDF document text
    • http://steblin.pro/lesodokujetomwyrul.pdfIn PDF document text
    • https://jeziwirumefije.weebly.com/uploads/1/3/4/6/134670599/2685243.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/3410887.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/life_and_death_free_download.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/gemizaf.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/fijudegepot.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/32b656e7-c5ad-4c4a-a7ef-a9c56933b88d/tafizotofinafov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff416e6-9759-423e-a45f-877c76c5c2f5/xufokefokikilijegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7e0cee-f81d-4053-a2a3-7148c6253abc/13767136432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e4ee4c-7861-426d-9db4-3b8c3d4c33b4/xorugudisexakopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d7359d-1897-4feb-9ac9-ce7158568f34/russian_characters_pronunciation.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5212 bytes
SHA-256: ee02286d3730e04821cea8ca846affa7782715afdfabe580878edd15db684a3a
font_01_sfnt_off0000fefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10776 bytes
SHA-256: 31338a7e5e45c9cc54659c594eefa00e8d30ebf9cebb265e4a1000633069b7f6

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