Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f18739d9b9f2f3…

MALICIOUS

PDF

85.4 KB Created: 2021-03-17 19:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01c0aeb46ea97d5d743682e7a963c131 SHA-1: be1aa1e64abb3c94733fdf27bc8e7c1e4260768c SHA-256: d6f18739d9b9f2f34550a51a1656faf4e5edceb886610b877918143ae9385673
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=kandinsky+on+the+spiritual+in+art+pdf PDF link annotation
    • http://zebekuji.22web.org/the_witches_bible_free_download.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/why_spring_boot_is_betterpussi.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/13776104954.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/zibekomegadixadovifebaj.pdfIn PDF document text
    • http://artdebug.site/top_bar_bee_hive_plans_free446v0.pdfIn PDF document text
    • http://zahlungsservice-ch.site/charter_cable_remote_control_applychs.pdfIn PDF document text
    • http://centerverifybadge.com/pt_agung_podomoro_land_annual_reporthjjot.pdfIn PDF document text
    • https://kotasixunepa.weebly.com/uploads/1/3/0/7/130776076/7167353.pdfIn PDF document text
    • https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/suzumowewalibot.pdfIn PDF document text
    • http://myfoxing.online/mowojuduvadugeveramezusemo82ac.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/checklist_format.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/f97da9.pdfIn PDF document text
    • https://turabevov.weebly.com/uploads/1/3/0/9/130968962/0ac3df4.pdfIn PDF document text
    • http://christmas-gift.ru/nunewilowobupuodeew.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/mipisovikufol_ruzuwapijip_wedojinetaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovitiku/4002387994.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/guzapogiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/social_and_political_philosophy_meaning.pdfIn PDF document text
    • http://dokajita.rf.gd/target_threshold_sheets_clearance.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/samsung_sm-t230_specs.pdfIn PDF document text
    • http://pogebikaku.epizy.com/17407736310.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_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 5264 bytes
SHA-256: 8bd65fbb94d760dcc84647942aa94983dccba875de4307976ae20804508fb0dd
font_01_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 10260 bytes
SHA-256: d6f81be4a74d5b4f7b7ec30a04e4c0ac69efa11d29955743222e8fccdcc4183f

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