Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef847d5960b7d5f6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 15:38:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e2105ed93678a6a16346da5f2943b10b SHA-1: 1e0c25ed2fe40fd7e12be56d11406439638f0d75 SHA-256: ef847d5960b7d5f63f32c70dedabcb58b05d9d1264829d591a9900afe9e31a07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware-distributing sites. The document body is heavily obfuscated and does not provide clear textual lures.

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://maypoin.ru/wix?keyword=elemental+skill+up+guide+ffxi PDF link annotation
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/ranano.pdfIn PDF document text
    • http://trynutra.shop/30923048659vq26a.pdfIn PDF document text
    • http://replyua.site/yoga_mudra_for_insomniarmihw.pdfIn PDF document text
    • http://teplotronic.ru/noxukolidezy47p.pdfIn PDF document text
    • http://suzodibolo.22web.org/22420453752.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/96181866931.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/1029307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavidoripo.epizy.com/my_autograph_kannada_video_songs_free.pdfIn PDF document text
    • http://tixinova.rf.gd/rijowinufabela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f546918-c40d-4333-bcfe-4b3d00beef46/why_does_my_oven_light_flicker.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_b283ba38c7834bc98e750ed6830d9166.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_0306279011994ee4b1db59a7c9e636d4.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_9ffcd1d8f01f40a392d2d8a23e29adf8.pdf?index=trueIn PDF document text
    • http://xevijojikutep.onlinewebshop.net/59566325443.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_1747c449b7c64ec2995958257ca944c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a26538-5693-42d3-8e58-9705bf85dacd/ice_breaker_questions_for_work_virtual_meetings.pdfIn PDF document text
    • http://jumajiker.rf.gd/25187864720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef704f37-f05d-421e-92e5-2063a447b83c/86821994719.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_274a8f4147614da99cd3f9c59f7ac650.pdf?index=trueIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/danielle_paige_dorothy_must_die_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919e323c-2797-44a6-bed2-35f358dbdc9a/67556975658.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_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 5356 bytes
SHA-256: 6be9d11b103a620bab431503073bf2878d149e3c1770b42455e76e0e9bfd497e
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 10684 bytes
SHA-256: 240fc01a29c44bd9c584a6c0a79fc855641586966ef4577f097dfaee260a52b2