Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d48a4f643e69041…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 06:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9427ea6ff5558f27356782b70ada95bf SHA-1: c66f29a56ca742d3935a0ae980b1c0bfa68b3275 SHA-256: 4d48a4f643e6904181b70b1b0c5e0f6d44e58219e73d332df95140dac8fda25e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain ('jottigo.ru') that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'existential therapist' information, which is a common tactic for phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=what+does+an+existential+therapist+do PDF link annotation
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/54032a5cc.pdfIn PDF document text
    • http://idealicaitalia.website/pibafakaniworojufepiqkq.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/96408043509.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/odyssey_fagles_audiobook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_6015dc10270c7.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/vabozabamorixamito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd77c14807a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_60351427944c5.pdfIn PDF document text
    • http://lemopebese.66ghz.com/combine_2_excel_sheets_into_one.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/tunumebe.pdfIn PDF document text
    • http://romeoplanet.club/canon_ip90_drivers_for_mac_os_xtijv0.pdfIn PDF document text
    • http://shoop-fm.ru/rijovesap7rsop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/marantec_m4500e_remote_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/34024030750.pdfIn PDF document text
    • http://pebulibupa.rf.gd/galvanized_corrugated_zinc_roofing_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/64088164648.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_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 5128 bytes
SHA-256: bc5f30b2e166a89d3cf318ba7e2b5f2bdf406b81805d6669efade6b82c95bd6a
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 10692 bytes
SHA-256: 81f1e55b3db1d9f0b0ed1f7220edd73feabcc25d22c7c170226d5498562a1747

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