Malicious PDF — malware analysis report

Static analysis result for SHA-256 770dd39bc5840989…

MALICIOUS

PDF

75.4 KB Created: 2021-03-30 18:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7fe86d4fca48747c4cd112a1f1d86ab3 SHA-1: 12e814f4ed9d9d2258b7b38f76dcb738f7e05630 SHA-256: 770dd39bc5840989aebd9a3b978c863213df7c58de77f55b606e72b4eefc82f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://dafemum.ru/strik?utm_term=how+did+colonists+treat+natives PDF link annotation
    • http://onatural.space/80085415886f4bpv.pdfIn PDF document text
    • http://nafesotarun.22web.org/miponat.pdfIn PDF document text
    • http://svarka-aurora.online/wonexanekobih2db1.pdfIn PDF document text
    • http://pasetbs.xyz/vatojitige71qs.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/hepatic_encephalopathy_2020.pdfIn PDF document text
    • http://erkutungotu.com/periodic_table_of_elements_worksheet4sx31.pdfIn PDF document text
    • http://aycotoro5.xyz/fugudufifpjlo1.pdfIn PDF document text
    • http://datinge.site/philips_norelco_aquatec_replacement_heads_at880qgcbl.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/40767425203.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/57638058390.pdfIn PDF document text
    • http://toppiksnack.xyz/internal_check_in_auditing_definitiono9n0e.pdfIn PDF document text
    • http://zulupid.iblogger.org/41865785533.pdfIn PDF document text
    • http://fumumowovufa.mywebcommunity.org/cage_framework.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/47023763675.pdfIn PDF document text
    • http://revasaxoz.epizy.com/31061147290.pdfIn PDF document text
    • http://sidajewaset.epizy.com/chicken_thighs_recipe_baking_sheet.pdfIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_e91e521d51bb4c0b8f6aab459e53393c.pdf?index=trueIn PDF document text
    • http://bibubojudij.rf.gd/spanish_english_dictionary_offline.pdfIn PDF document text
    • http://xedonufil.rf.gd/13768083167.pdfIn PDF document text
    • http://nowaginog.epizy.com/gulixemejujowuju.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_a809024dea6347b7ac9fea7016257582.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_662a67df30284f16a739d92f5921fb18.pdf?index=trueIn 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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5048 bytes
SHA-256: 99dd77b1e7c408e1e27fee6c9447a179e1d5984b40ed8c2f3a2087384d148651
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10308 bytes
SHA-256: 2d4c71d65779c870f9f81c86f4dcab92410a6c591db364e891f9a9a87787b970