Malicious PDF — malware analysis report

Static analysis result for SHA-256 610419861e8ae8d0…

MALICIOUS

PDF

70.8 KB Created: 2021-03-25 22:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27c33dfb745f76d2ec3820cc680573e8 SHA-1: 557e67711f30e2ca58ee999a38a5cbeff2a27f30 SHA-256: 610419861e8ae8d0a26aa7353d85bfcee4264ed203abc454e2fa495563a10dc5
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 0.9996

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://soxebez.ru/strik?utm_term=distributive+property+of+addition+worksheets+3rd+grade PDF link annotation
    • http://fb-pageunderreview.com/kenmore_elite_dishwasher_clear_error_codes19x1o.pdfIn PDF document text
    • http://simamopi.22web.org/50904118552.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/neditoxipaxeper.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/kidosajiturajuj.pdfIn PDF document text
    • http://shlifovka-pol.website/zubakusitibumawutalajidimgo8r.pdfIn PDF document text
    • http://fegudifo.22web.org/what_is_a_tropical_rainforest_habitat.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/kimit.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/e6f4137f.pdfIn PDF document text
    • http://supportcopyright.net/solar_water_disinfection0yt0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_0bdec4b1aa1f4a1fb34a12da4c750551.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_df5ff530a2a1449e97c53b3f18ce3317.pdf?index=trueIn PDF document text
    • http://zapiwolatuw.rf.gd/how_to_reset_the_unifi_access_point_to_factory_defaults.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/xisisabigavozabo.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_3e3dfb773f76485d90def6fb1e03ed45.pdf?index=trueIn PDF document text
    • http://xifazofikumufe.epizy.com/novamazabivab.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/rekatiperoraz.pdfIn PDF document text
    • http://bopunuzas.rf.gd/dubojowutudibatipenu.pdfIn PDF document text
    • http://gesebokumu.epizy.com/cvc_words_phrases_and_sentences.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_97e9f3b8397246d79e68ffafb051c511.pdf?index=trueIn PDF document text
    • http://mezezotunofugus.rf.gd/the_anarchical_society_by_hedley_bull.pdfIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_88094ebb361a4ebab463752393975966.pdf?index=trueIn PDF document text
    • http://difugarulid.epizy.com/84161622134.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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 5892 bytes
SHA-256: 02b3eedfc9f0bcf662b4ec7dc92e39587c82aead2591e66acb4bb6a4b59cc6f1
font_01_sfnt_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 10036 bytes
SHA-256: 6d18d3d62cfc6a133cc6dab95ba042d3b1c876841850a73a4f1d361b35df6b9a

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