Malicious PDF — malware analysis report

Static analysis result for SHA-256 149bb01004261142…

MALICIOUS

PDF

78.0 KB Created: 2021-06-13 07:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a83f4aa88a7690a204c752d768adc39 SHA-1: 28c35f340c89d24fc66be732379c3ffdddbdcca7 SHA-256: 149bb010042611429140494fe486ddd8083f46283849e25af670d0e6d130b7dd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The primary URL, 'https://pixomot.ru/pbw?utm_term=installation+certificate+format+in+word', combined with the document's metadata indicating it was generated by wkhtmltopdf, suggests the document is designed to lure users to malicious sites under the guise of an installation certificate. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/pbw?utm_term=installation+certificate+format+in+word PDF link annotation
    • https://genaseturatu.weebly.com/uploads/1/3/4/6/134615139/8383964.pdfIn PDF document text
    • https://xofuvavafifibib.weebly.com/uploads/1/3/4/3/134386759/9849861.pdfIn PDF document text
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/bafetineja_xamanexuga_moxifazubuvagu_zomopaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5fe5a2debc62f.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/641200b.pdfIn PDF document text
    • https://juwulonureli.weebly.com/uploads/1/3/2/8/132815178/7898585.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/vatijazugovuraj.pdfIn PDF document text
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/fobubezitopizop-mapovura.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/3210269.pdfIn PDF document text
    • https://fetuxugov.weebly.com/uploads/1/3/4/6/134655394/5bf5eef976.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366005/normal_60b71730c85a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemususi.pbworks.com/f/54442161961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580b9105-831d-4663-bfcc-020b0e2229e2/puxexajule.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/how_to_read_a_lowrance_hook_fish_finder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9e5c56-760b-4271-aa8c-4f8e582f51ce/is_curved_tv_good_for_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9fa631-fd18-4620-b440-45ec27440791/1814337006.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/w/file/fetch/145214328/ben_generator_rex_heroes_united.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/lalepekogukuwuviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fa919f-4518-43dd-bc0a-fceb5243b77a/sojipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8903b2-6ca1-4db1-8983-517648b9b02f/59481560164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f7cb9c-629a-40a3-b783-4185b679965f/pes_2016_license_key_download.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/reussir_dalf_c1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db28ec2b-bdad-4403-8178-a0c31f10c985/nepupefakol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee75db78-ab1d-4bca-b366-d12f03c44181/pubuwaxeratole.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_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 5196 bytes
SHA-256: 5f5ff1f3edfdc3bc518c42788926d15a4df39035371c726a1e2ea175edb0dab0
font_01_sfnt_off000106ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10440 bytes
SHA-256: cbba89124d5cf7cc65a62a8bd1e6c2b551746744fcae37113b63d95dcb76fe7e