Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecb51c5fee3cb60…

MALICIOUS

PDF

70.9 KB Created: 2021-04-09 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 75c64e4ddc8549537b5e44aff1983a51 SHA-1: 9c28ea6921d7ebd4282cea6fd0cf411c3c182932 SHA-256: 0ecb51c5fee3cb6015a095ef740f1c78de41c7055169b2d0c4fd74bd6449bbf7
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 0.9998

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://jacksth.ru/strik?utm_term=insinkerator+555ss-1+manual PDF link annotation
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/putivenew.pdfIn PDF document text
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/2e5db3380dc1c28.pdfIn PDF document text
    • http://pycnidwzxc.info/ibanez_gsr200b_gio0y7fn.pdfIn PDF document text
    • http://copyrightprivacy.site/capitulo_2b-_2_answers_page_41577sh.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/fitab_jakanotobi_vijixozut.pdfIn PDF document text
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/2680389.pdfIn PDF document text
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/zixivorinafaju.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/xilugo.pdfIn PDF document text
    • http://goldalbum.ru/fufefipodekidiretatufilaslb9h5.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/boranefitez_futunizajeva_ketabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_428ef5a8387a4e9f8aff6501430faa87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezewu/pozusodut.pdfIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_e2a9dff1581b4808ae35d8d3f108bb95.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_061e9cc6475144d0b6afba4a593e4de7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/cartas_alejandra_pizarnik_leon_ostrov.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_d81e0d1de7274528ae897c3cbc607936.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_05fc52a5c9ba4487acb62d7c6d22bb0a.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_c4c439469fdd44a98c097a4d7ceb4ccb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/axial_yeti_xl_sway_bar_kit.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5040 bytes
SHA-256: bd5a6d4f5a52bbe89463fe87109dae324d6c448798be28f874df4cfd3b166262
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10300 bytes
SHA-256: 6841eb1ac65bc9c217f0da76ddcdd0508ceb478aff0280e519ba0489119d76f0

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