Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d3527afc6a814f…

MALICIOUS

PDF

89.4 KB Created: 2021-03-14 21:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1b8ca425913161af70a8e6a45017d4ed SHA-1: b06fb59134bad45ca2449e4e2b0bf1b8d2151637 SHA-256: 38d3527afc6a814f5f8d33e832a97784fbae68112f14432fb81c1b5b94e39ae9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which point to redirectors or SEO farms, indicating a phishing or malware distribution attempt. The embedded URLs suggest a lure related to 'ecocardiograma stress con dobutamina pdf', likely a pretext to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/123?utm_term=ecocardiograma+stress+con+dobutamina+pdf PDF link annotation
    • https://cdn.sqhk.co/nuvexajamu/giBmyhe/worship_songs_lyrics_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_604d633427339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426690/normal_6006e72e8228e.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/sig_sauer_p320_40_extended_magazine.pdfIn PDF document text
    • https://cdn.sqhk.co/norejasiwiza/gjadPzr/visuwexegeterebafoxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fec8c946c782.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/cwibhbf/dumas.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/how_to_fix_a_singer_sewing_machine_timing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_602eff9dda9c8.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/mcculloch_pro_mac_610_chainsaw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/Hhjifii/primesearch_service_provider_corporation.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/9FTcAbY/23897731869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_80188db074ae45bbaff09c979e571ecf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/por_que_es_importante_la_inteligencia_emocional_en_las_empresas.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_bbcbb06e04e34677bda4709bae8bd54d.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_6d6a3821b58d43ff9577c7bf3fddb3a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rowubunak/56048359726.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_48503cc74735471889e4386897ef1f70.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_b86bc62874034e7fab99b78287f2f2f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/gusatobipukakamagulekapiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/oc_caste_list_in_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/ambulance_siren_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/38317265506.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/chinna_mani_kuyile_song_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/cat_in_the_hat_poetry_lesson.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_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 5540 bytes
SHA-256: 796bda413a465cfa396844fea95ef9baa56c94661b6073f95853f59d74c3f040
font_01_sfnt_off00012fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAE 11900 bytes
SHA-256: 7fc720fcfa5ef03fb5a4663bd1d9d50532a57a343bd62332df1f1971703a8819

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