Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c766256d9884ce…

MALICIOUS

PDF

70.5 KB Created: 2021-03-21 23:39:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0379920fb11c38a5377cf24f8ef73c5c SHA-1: 7ccd0f33b3c1168132d94c3912702b3c59e1a8ae SHA-256: 88c766256d9884ce0d42f39031e51ccd78c832d1446c2e203155e2ec0212126a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=usu+housing+map PDF link annotation
    • http://ubsvp.com/rival_20_qt_roaster_oven_parts816s2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_604eb3d3cd1ce.pdfIn PDF document text
    • https://bozalugim.weebly.com/uploads/1/3/4/3/134343660/tanawa-nurusumukoxe-nibidilititobux.pdfIn PDF document text
    • http://instup.xyz/33566211368g3qk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407804/normal_5fc9197075255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5fd83b327042b.pdfIn PDF document text
    • https://givebuzuwipagin.weebly.com/uploads/1/3/0/7/130775776/2768629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_6026d1d0bea95.pdfIn PDF document text
    • http://nikepexi.22web.org/bride_and_prejudice_full_movie_hd.pdfIn PDF document text
    • http://vobonenagixavus.66ghz.com/khatrimaza_bollywood_movies_2018_hd.pdfIn PDF document text
    • http://mesretly.xyz/67365131658eebkf.pdfIn PDF document text
    • http://jelaluk.22web.org/expressions_of_interest_template_free.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/2574387.pdfIn PDF document text
    • http://kupiokno.su/67457170975n09z0.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/webipejonavuv/power_bi_report_server_authentication.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/travel_and_tourism_competitiveness_report_2018_greece.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/avast_pro_antivirus_2017_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/valifogosetipusotum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3574c50-2d6d-4b62-948d-60db5a8f0f62/73184515835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc58c2f-342c-4312-9993-aa825281e872/wefakepoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8a4c98-e015-41bc-849d-107a23d44646/91687827455.pdfIn PDF document text
    • http://tuxesoguzegisox.epizy.com/fipilujezegavafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f260862b-c9f3-49b5-bb52-0208856bc974/pentair_whisperflo_pump_curve.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_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 5096 bytes
SHA-256: f4ea0ee96bc666d3c412c554cf8170be5b8c29f5fa8c05787f6ef8afb22efa10
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 10532 bytes
SHA-256: 257671b4b2e197423f5a42ead77768cb96bf01d38aa2d2a3a2cc3ce2b787311e

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