Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e28ed5424e3f38…

MALICIOUS

PDF

81.4 KB Created: 2021-03-09 11:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 29062f189d71df624c06965096216cc3 SHA-1: 4027568dea201baa1e3dea60e2db34f12908d9ad SHA-256: 57e28ed5424e3f38a2b13dfed174de101534b9bb8de80baa6483830dfe724e7e
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it's designed for phishing or redirection. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, with a critical heuristic firing for a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=where+i+can+donate+toys+near+me In PDF document text
    • http://dronextactical.xyz/publix_wedding_cakes_reviewsk93fy.pdfIn PDF document text
    • http://epipog.com/is_taco_bell_fresco_menu_healthyzz2ct.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451929/normal_6013c1d14ccef.pdfIn PDF document text
    • http://semengergel.ru/bixagixilizubila97ik9.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/ionic_and_covalent_bonding_answer_key5wne5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5ffde20c81d5e.pdfIn PDF document text
    • http://centerbluebadge.com/maze_runner_death_cure_movie_synopsispq2fn.pdfIn PDF document text
    • http://fastpysystem.online/lenguaje_corporal_gestos_y_su_significadoxsdeh.pdfIn PDF document text
    • http://help-service-support.com/63599621166b61ps.pdfIn PDF document text
    • http://iminn.ru/ciclo_de_vida_de_ancylostoma_duodenaler8ftn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ff6ab642831c.pdfIn PDF document text
    • http://oneitshop.info/sojivolabajiwojotu3j6pm.pdfIn PDF document text
    • http://fherixq.com/htc_m8_factory_reset_not_working4etp7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_6034f80b5e6ab.pdfIn PDF document text
    • http://registrat.space/duck_hunter_camo24761.pdfIn PDF document text
    • http://creditscoretrack.info/vurawekapemefuxe6n8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5fe61f752d005.pdfIn PDF document text
    • http://mamontov-net.cc/punnett_square_practice_middle_schoolxaqpi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/429be595-21a0-4119-9249-9fd4d70b2b2b/panasonic_kx-tgc220_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c2be3b-b384-4f16-ae2f-87b55cc3ce15/map_of_canada_including_prince_edward_island.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/vapoki.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/jevanaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7945740-bbc6-4248-b4c7-aa270df050f1/how_to_put_on_ergobaby_omni_360_cool_air_mesh.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/67147153087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd16475-5581-47a2-92d3-c8f79a1c1e57/doparadusezugut.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/2697428604.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 5052 bytes
SHA-256: b33702668d4ab673754448480a74a0219bb9e19e10206402e8e563d9b94bea3d
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 11192 bytes
SHA-256: 4b7c9817014c8eb787b7220fe97770589d5ee1fe96a7ae1beffa07cb0b034fd2
font_02_sfnt_off00012a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A03 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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