Malicious PDF — malware analysis report

Static analysis result for SHA-256 e256d7d6bd430502…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 16:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e639d815ed6a0e2df538fca248bc6e3 SHA-1: 53154418b6d060c9ea869f29b36866c8bec4f1f6 SHA-256: e256d7d6bd430502a76471a55bf36a1a2fd0ff671664a19be53794d25bb2090a
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 0.9995

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://gimoguvi.ru/strik?utm_term=samsung+a10e+screen+replacement PDF link annotation
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/4827529.pdfIn PDF document text
    • http://1xbet-regi.site/saxekaknc8d2.pdfIn PDF document text
    • http://fruit-ital.space/juwiwinosumomawawesetetz9uo.pdfIn PDF document text
    • https://guzagixugowe.weebly.com/uploads/1/3/4/6/134687381/6549907.pdfIn PDF document text
    • http://vorgazme.com/fuvimomapokqtyrh.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/retajokapubet.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/xosemexonajodizix.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/29520919938.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/beginner_pirates_of_the_caribbean_piano_notes_with_letters.pdfIn PDF document text
    • http://italiahot.space/riwiwabenulagolepb6m4e.pdfIn PDF document text
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/1421569.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/8369066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_c43ee18a20884878864e2d6b7cf85bbd.pdf?index=trueIn PDF document text
    • http://wenares.myartsonline.com/what_is_an_easy_way_to_remember_the_metric_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b253533-5693-481d-8d35-3df8d378d54e/openoffice_writer_formula_editor.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_0c302afd7b154bdaa38e84ba3c8aa242.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa5895c-28d8-4a5f-b637-ae1fe9555148/nirerubemorogogogaxikad.pdfIn PDF document text
    • http://zijedan.atwebpages.com/61856893239.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_17380378afb745cb981bce720e9dffd8.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_640714f8d08b4b348df4ffb4f7e0db42.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_c6f2d07fc6c6465dad3023ace78ee080.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_72613a4b17714ace90111e5f7ebcbea2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 5552 bytes
SHA-256: fa64a86b7498cca4497dc6c3bdf6164ac9c69edc6449ba3dd07664c707080e36
font_01_sfnt_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 11532 bytes
SHA-256: 357da3b85237155506191a00d0c3ed0c4d84d07d2938ff16c9795e77d504f492
font_02_sfnt_off00012a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 16308 bytes
SHA-256: af6251b35dbc12768bc9a6bbed2938d888dc93d6fca628dea7862711ce595848