Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6c4d522c0a7cb9…

MALICIOUS

PDF

74.2 KB Created: 2021-01-25 03:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 831ba0a646876042418fca95784994f5 SHA-1: dac9a549d87e0546ce67c37dc4ec509a6180d683 SHA-256: 0f6c4d522c0a7cb9ade1034a61d24eadfffc8c5ad3e78b989bf7f4051314bf37
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a mass of external links, many pointing to disposable domains, and employs a social engineering lure to trick users into installing a browser extension or update. This behavior is consistent with phishing or malware distribution campaigns. Although no scripts were explicitly extracted, the PDF structure and the nature of the links suggest potential for exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafficel.ru/123?utm_term=error+occurred+during+initialization+of+vm+agent+library+failed+to+init+instrument PDF link annotation
    • http://triple-doska5.club/pago_facil_recarga_directv2hcgo.pdfIn PDF document text
    • http://rat-red.space/days_cash_on_hand_benchmarks_for_hospitalsjlyvw.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/taxunurulipudam_goruwubujoba_satin_zujoxewo.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/b92baa55dc3f2.pdfIn PDF document text
    • http://copyrightviolationcenters.com/5183134627hculb.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/39dba6c95b.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/8243358.pdfIn PDF document text
    • http://particulieres-societegenerale.best/mapa_del_tropico_de_cancer_en_mexicorea5x.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/a976035dec8.pdfIn PDF document text
    • http://kinokaiff.space/stick_runner_to_carpet_stairscuy49.pdfIn PDF document text
    • http://waguzeb.66ghz.com/bootstrap_form_horizontal_full_width.pdfIn PDF document text
    • http://tikovg.xyz/56827277147c27ov.pdfIn PDF document text
    • http://infokurs.design/wyvern_creations_crossbowsmbf29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabitivawenavox.rf.gd/aegisub_free_pc.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/danowuxujoxogas.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_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 5648 bytes
SHA-256: 2333030d98b87db3e7f1a247eaa9559645c4cd9a89a11f690c3e2fb3e1da6368
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 11568 bytes
SHA-256: c60e769ae224762472969457470bf41809081e7364dbe6634eb1a8051bb29dd5

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