Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7618e1ad7a669b…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 02:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 004b67f13cd54f48fb7a2cdb38fedc8c SHA-1: 970b5bc7f08c4f1d26d6a56f783703a20649ed9b SHA-256: af7618e1ad7a669bcb1cba3b8e3276a9f73e58e01068c30d14e2acc21261e546
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. High-severity heuristics indicate the presence of suspicious and invisible links pointing to external domains, designed to lure the user. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and URL analysis point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=l%2527art+de+la+guerre+sun+tzu+ebook+gratuit PDF link annotation
    • https://cdn.sqhk.co/zukasedu/idjdyjf/the_best_of_music_80-_90.pdfIn PDF document text
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/loravavenaga_ziguturigej.pdfIn PDF document text
    • https://nojugebi.weebly.com/uploads/1/3/4/3/134321301/9551080.pdfIn PDF document text
    • http://postel-na-zakaz.ru/38187893287hhp47.pdfIn PDF document text
    • http://lady-bug.club/macroeconomics_book_sandeep_gargzb4yx.pdfIn PDF document text
    • http://okrasote.info/nerezabilikopabamipanasulzhrll.pdfIn PDF document text
    • http://palifagumelu.22web.org/baby_sleeping_songs_tamil_free.pdfIn PDF document text
    • http://qwert-ita.fun/editable_wedding_invitation_templates_for_friendsi3diz.pdfIn PDF document text
    • http://yoga-fitness.space/the_language_of_composition_reading_writing_rhetoric_second_edition_freexcxyo.pdfIn PDF document text
    • http://operationhomeplate.com/density_of_the_earth_in_kg_m35s03n.pdfIn PDF document text
    • http://lnstagram-support.live/rival_gears_racing_apk_mod8rmls.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/atoeohz/golotutexolasatemuto.pdfIn PDF document text
    • https://cdn.sqhk.co/toledexipez/gfuUSuF/easy_voice_recorder_app_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafurug.epizy.com/obstetric_cholestasis_nhs_guidelines.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/cisco_ise_radius_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/hand_lettering_template_procreate.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/foam_sheet_size.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/performance_comparison_angular_vs_react.pdfIn PDF document text
    • http://dosevidi.rf.gd/ccna_full_form_and_meaning.pdfIn PDF document text
    • http://moliposapivar.epizy.com/gaxesufenunapuviweresog.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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 5224 bytes
SHA-256: 38f6e39907d42f325d793c35e8c58a5f4b1477f8aabb9e59b36946d21fa9fc70
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 11736 bytes
SHA-256: dcb437ca085af582d5796c1ecfb57722ba520c5ba08d25d1e46e63b508712b45

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