Malicious PDF — malware analysis report

Static analysis result for SHA-256 6897c9261dccdf0c…

MALICIOUS

PDF

80.9 KB Created: 2021-03-12 05:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 77e61e72edf7d80869fedf87be41804e SHA-1: 28fe05864b050fe422dfc548e2940179d3af2a06 SHA-256: 6897c9261dccdf0cccb5aa99ea96bf5a10a7b359eb0a17ba56797511fac5c476
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

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://resalured.ru/123?utm_term=kproxy+for+android PDF link annotation
    • https://cdn.sqhk.co/pedidagow/iiif2gh/kofiwigusijozet.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/bMgh7jg/lenovo_thinkpad_x1_extreme.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/QrhcDjf/jijowopurividuvi.pdfIn PDF document text
    • http://bepibolet.22web.org/fodudavaretot.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/idcifWC/99946050761.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/puziwemugu.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/lmjhcgh/flip_master_hacked_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/cDMhf5x/jury_service_excuse_letter_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/bZ01ibs/40291709555.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/fgchbhd/37737127876.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fugewad.rf.gd/cook_county_assumed_business_name_form.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/30306475845.pdfIn PDF document text
    • http://legopolo.rf.gd/functional_patterns_core_exercises.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/how_to_program_xr2_remote_to_element_tv.pdfIn PDF document text
    • http://sekovukubetib.epizy.com/patinularepebuwijopowoze.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/zesikomun.pdfIn PDF document text
    • http://tevaluzax.atwebpages.com/wijafefabovupibe.pdfIn PDF document text
    • http://wivufaw.epizy.com/edit_text_ke_word.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/dimagojazilefuku.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/vebolapozefelof.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 4964 bytes
SHA-256: c0a40d4dec2cba716e86750d32b41b9f8615cfca8d3738d9db0b04a56e0a5dce
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 16420 bytes
SHA-256: 0fd3d5f199b1857bb3d5580e934aa528e67cfa5c3f982998ca17363fa4c7f798
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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