Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b18a6b4c8dde10…

MALICIOUS

PDF

97.4 KB Created: 2021-06-04 05:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3c96e2f6165350527f59b4e614cabe87 SHA-1: 70cdae475d33449ba8fd199567db3e4ba8dfa987 SHA-256: 88b18a6b4c8dde10efb9d9ab104398996c822e1b22952a62577181a0d7d6e58d
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://irlanc.ru/pbw?utm_term=minna+no+nihongo+lesson+16+mondai+answers PDF link annotation
    • https://wajodiladifaxuv.weebly.com/uploads/1/3/4/7/134768632/1f86955.pdfIn PDF document text
    • https://kogababofaf.weebly.com/uploads/1/3/0/9/130969162/9198909.pdfIn PDF document text
    • https://fisofomopix.weebly.com/uploads/1/3/4/6/134603918/6b0ae6167158562.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/povujifowidibuxowo.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/5084216.pdfIn PDF document text
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/0321b9f15.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/tuwitak-gapebojisutobo-pomowubuzikoto.pdfIn PDF document text
    • https://vojoritus.weebly.com/uploads/1/3/1/1/131164067/mimesowisi-jenuzatalavika-fatibupa-favusuvofusoro.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/9379343.pdfIn PDF document text
    • https://texerazijibegu.weebly.com/uploads/1/3/5/3/135302316/vitakawuwazavavosa.pdfIn PDF document text
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/gesavijeji_rugipetixemer_gikiruliwop.pdfIn PDF document text
    • https://gepubife.weebly.com/uploads/1/3/4/3/134315704/xakoxem_xakokikozegugul.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/929af1ff-c576-4ab3-93dd-c7139695662d/93747013796.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144440445/59228458783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ed1cd7-c150-4486-9c94-2f47ffd7c769/verizon_router_blinking_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7144b4-f1e6-42e5-8a31-f438f55a4df1/rimoputodu.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/financial_statement_analysis_and_security_valuation_5e_by_penman_s.h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ae3563-9d1a-4298-85c2-58f877a56536/download_naruto_ultimate_ninja_impact_mod_storm_4_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2034ec2c-13e8-4970-ad8f-28df2ed0453e/what_is_the_code_for_the_safe_in_call_of_cthulhu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cc959c-e37b-4287-847c-e54047585aeb/arctis_pro_wireless_setup_ps5.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144590559/tijimebulekaxegixe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 25116 bytes
SHA-256: 37b655ee182dd28bca1d3207a1576cdbf5365b56e329be85a3ffdfd0d7ed0e81
font_01_sfnt_off000140ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140ED 5540 bytes
SHA-256: 08a0e09a563aad4eed3708aedd56ca7acbaef9fed31e4f9f2c0e0d2bfa1453a9
font_02_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 10476 bytes
SHA-256: 08f22cc2fbcf207dad24e144588fd3147ac04c2792480d5369290f97cc03235c