Malicious PDF — malware analysis report

Static analysis result for SHA-256 0988909ddd97e3f9…

MALICIOUS

PDF

85.2 KB Created: 2021-02-20 02:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf46f0ff8781ad5e321a3133fe244427 SHA-1: 931aaecbac89f007712f4bf5034a8eb662f3b8b0 SHA-256: 0988909ddd97e3f91ecfd4c13419a2c5752e3ef513ec547b453bdbcb8c1c5926
66 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with a high-confidence ML classifier flagging it as malicious. The document body, though heavily obfuscated, suggests a lure related to academic citation. The presence of numerous links, many pointing to disposable hosting, indicates a link farm or phishing attempt. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/strik?utm_term=how+to+cite+a+case+study+in+apa+with+no+author PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385631/normal_60305944bc052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_5fdff072566ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_601db0a964c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_6025e63c38061.pdfIn PDF document text
    • http://ralanizu.iblogger.org/72524919642.pdfIn PDF document text
    • http://xojitufos.66ghz.com/equality_and_human_rights_commission_report_universities.pdfIn PDF document text
    • https://romadixisom.weebly.com/uploads/1/3/2/6/132681692/kabase_tilit_rabedotog.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/jotul_602_for_sale_vermont.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcb4a46ae9dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paporoj.rf.gd/free_grammar_editing_worksheets.pdfIn PDF document text
    • http://rigirulame.epizy.com/jodi_picoult_books.pdfIn PDF document text
    • http://nirobow.epizy.com/zotat.pdfIn PDF document text
    • http://zezazemana.epizy.com/57651774183.pdfIn PDF document text
    • http://dexupanuwobazab.rf.gd/69329627068.pdfIn PDF document text
    • http://javisan.epizy.com/nela_ticket_songs_free_0.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_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 5284 bytes
SHA-256: e7fa84570dd4caf02f76864e527fb103211db1c372348fc6e7a6190d17f27a1e
font_01_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 11732 bytes
SHA-256: b5fec393184e84b05def722bc44a915dc8b17eecc382e962a14228d9e501dd75

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