Malicious PDF — malware analysis report

Static analysis result for SHA-256 15971bc3f3e3aced…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 15:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 517ad5def4edfa7456655bbcb4552172 SHA-1: a5d4981d094991249a86a8f8a065855d86e1d1ec SHA-256: 15971bc3f3e3aced6017dd658528b2bd148d783a228bb75058136945c1c22fce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. While no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

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://vilenefex.ru/wix?keyword=packet+tracer+10.1+1.4+answers PDF link annotation
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/gorilegizesu_gusemutuku_marobavumojeje.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/jgeggjf/61932880146.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/6814487.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/EYWgiie/woodturning_magazine_uk_back_issues.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/kicibjj/tunibidebanok.pdfIn PDF document text
    • https://zadopuvaja.weebly.com/uploads/1/3/4/8/134892734/7384643.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/liselomarasu.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/4029639.pdfIn PDF document text
    • https://bixunirejo.weebly.com/uploads/1/3/5/3/135329058/1830436.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/rotiwifef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4522aceb-5ba0-422a-8331-a7b350ed7f8a/tomanifolur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66170ff5-a4ef-4830-9f91-f87e14f9f3ba/2008_lamborghini_gallardo_spyder_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d348d7a7-e9c1-4f60-82c5-9f7a4ee0ab92/jujitoneto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ed6038-7bdb-4baa-a0fe-afd69c478838/kubudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbf8a5a-b17e-4236-b01d-0168e4b63869/75451921560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25e7d6d-6724-4d68-99d3-5b9ae28996f3/kumubiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb80679-9faf-40ea-853e-1efa903fb8a6/how_to_pair_ps3_controller_to_fire_tv_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a08a3d7c-93bd-42fb-adab-b6902c6f5367/53569617518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6092cb-7b8b-41e8-b3d1-0dc7db09eedf/89184289185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33d89717-34ac-4cd5-b6df-667aa5e9b7b3/advanced_algebra_trigonometry_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f82867b-3faa-447c-b9a5-d003f7cdf62c/jonutofipurefikogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29dc99b7-d4bb-45c9-84ea-6e204c7872c9/how_to_reset_arachnid_dart_board.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_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 5232 bytes
SHA-256: b62e5d023da11ff4c3b58d6c9e0824aad3def33ae950f4ba2f223107615864e4
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 12364 bytes
SHA-256: 2cd7c5b56a2154c3d02680ca6c367a1e5b4f862e8857d2eb6b3d1967bbff4839