Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b33af0da1b0f41…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 00:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f5a4a1805ad931440d1d46f314bebe9f SHA-1: a95b103bb586a05c646cef6a8cbc0bc32f2a533b SHA-256: e7b33af0da1b0f41bb9266ebfa6b01479e155abf01d98b571ada648730701327
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 phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO poisoning or to redirect users to malicious sites. One such link is http://wowadepadon.rf.gd/collformic_matagalls_amb_nens.pdf, which is part of a mass link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/award?keyword=a+horse+and+two+goats+workbook+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368736/normal_5fe2a24e6b02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_60296cf7551db.pdfIn PDF document text
    • http://keto-menu.online/how_do_i_reset_my_yamasa_slot_machinevfnjo.pdfIn PDF document text
    • http://rakufudufe.iblogger.org/periodic_table_elements_printable.pdfIn PDF document text
    • http://sdfafq.info/what_happens_if_we_die_alonene5ly.pdfIn PDF document text
    • http://mavito.online/20516337369n5c1o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_60262d248cdd6.pdfIn PDF document text
    • http://chambrehq.xyz/37052123960zjikr.pdfIn PDF document text
    • http://copyrightshelpscenters.com/tutobemogowopagozaxartt3v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_6052d87e3864e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385847/normal_60098e3e9dee7.pdfIn PDF document text
    • http://ipatovaalena.ru/sotovemumavorujag481jl.pdfIn PDF document text
    • http://evatopshop.xyz/nofisexuvivavinotanusuflouye.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowadepadon.rf.gd/collformic_matagalls_amb_nens.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_0a91fc94161c4618a84e4a333582ce8e.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_32ccd31012544d3a9c6e8eb50269487a.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_829d0037ec7747429387e29c064e0787.pdf?index=trueIn PDF document text
    • http://pavinudoj.epizy.com/berezobil.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_35fc0b995e2d437c8be819301ea1823e.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_bb4412c5b31145dd9627f2d24e50de1d.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_10ad7b328c34412b9e0db028c82e0f1d.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_de1a9fc5290049e3a0ee35433872faab.pdf?index=trueIn PDF document text
    • http://pibuluxe.rf.gd/fazosaxuxisivilo.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 5556 bytes
SHA-256: ee5b3e835550c1cd31efbcfb257e56d3406be57e73dd17093931eb0b6fa196a6
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 9904 bytes
SHA-256: b84378f9602188b6315aa1672b47ebb7da09d92c1ca4d5d998bf483fea15f606