Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea6d72b181a6a2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 16:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e011b8489c8cebd860652989360d5efc SHA-1: deba4480808966ed64c2e3f3c63580a71d5647a4 SHA-256: 54ea6d72b181a6a233e9833bb59ace348b9bd606cbd6c0296a61a834afd767d1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. Several heuristics indicate this is a non-clustered link farm on disposable hosting, with many links pointing to other PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or engage in SEO manipulation. No scripts were extracted, and the document body was heavily obfuscated.

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://mezovuduw.ru/award?keyword=laboratory+apparatuses+and+their+uses+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4859821/normal_604a3fb12b7f5.pdfIn PDF document text
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/pozot-wojobob-lipabesuna-wuvibifimibep.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/EhfdX9I/word_craze_level_724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601f0e50ea248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_601b538c098ad.pdfIn PDF document text
    • https://jopepikenaz.weebly.com/uploads/1/3/4/6/134652119/1321219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fda7456ab7bb.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/RBLhhd8/91592348678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021908a74841.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/bapeseperipale_wuvenawet_sasal.pdfIn PDF document text
    • http://kurutog.mygamesonline.org/13757_cerfa_03.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/politik_identitas_dalam_pemilu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hhMggSK/piropuweve.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/id1iBie/texas_instruments_ti-_84_plus_calculator_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juludiripo.myartsonline.com/pf_withdrawal_form.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_199c113e50cb4bfb9f13dc5741a1bd33.pdf?index=trueIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_9f2ebe5b6155461abd78abdbf5a285f4.pdf?index=trueIn PDF document text
    • http://relivoziz.atwebpages.com/3522049622.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_f8f9cf61d68c47a4ada880ac516675e5.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_f917cbf8876448a1b78da3ee9c83093f.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_3d2c63c460974eb0b2bb179c2f09ee80.pdf?index=trueIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_994deffd099b4791a51fffdce8f0a8bc.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_5f89747b425e46688f0eac085c6bd520.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_adfb17008086498291fb06771baee1c8.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_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 5280 bytes
SHA-256: 819d60147a2170b3213feb53e74f49ac188476ca00891b63c38f2725a04977bd
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 10820 bytes
SHA-256: a79e49f02d7d52db3956ae5fe27c4f35109c0f893706a79c3de38078819287f4

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