Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf921100babdce8…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 17:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c1c84c436bab7c3ed6419e5a6ca20168 SHA-1: d573d1f826c4590463ca3834f8edf2373e11ce13 SHA-256: acf921100babdce8fc2f16611207a326af949e9f6ea40f86cbfb502dd96810f6
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to suspicious domains and one explicitly flagged as a lure for a malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://gimoguvi.ru/123?utm_term=throne+of+fire+movie PDF link annotation
    • http://help-bluebadgecenter.com/computational_fluid_dynamics_application_in_automotive_industrywe4ra.pdfIn PDF document text
    • http://5coupons.info/map_reading_questions_and_answersb6ec5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fec884cf1819.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/how_to_type_a_music_note_on_iphoneq7gzw.pdfIn PDF document text
    • http://weareanonymous.org/lazimumabomiw86ung.pdfIn PDF document text
    • http://becloud.website/24711448001x7ukv.pdfIn PDF document text
    • http://poopo.ru/how_to_analyze_percentage_change_datacx01p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5fe122620a23e.pdfIn PDF document text
    • https://sadusobagobazep.weebly.com/uploads/1/3/0/7/130776682/sovopikenil.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/why_is_my_kenmore_ice_maker_freezing_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_600ebce37cd41.pdfIn PDF document text
    • http://paksorond.xyz/apache_jmeter_windows_104gd7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_5fe615b39e54c.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/marimejerebo/akathistos_ymnos.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/browser_video_er_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/blade_runner_2049_tamil_dubbed_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/financial_accounting_terms_dictionary.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 4596 bytes
SHA-256: 3245a30e15f362eaf010e9834b5affa9b7c445a23efc286bee6740a9c3f5adb2
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 11040 bytes
SHA-256: fafea897796c8887ba85fee2ddb67d46f6712f475a7241fd9ac44afa8c78a144

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