Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03b8e5faac40833…

MALICIOUS

PDF

104.4 KB Created: 2021-03-10 19:19:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1e5d16505f97f8efd0c5d538945572d8 SHA-1: d7e0f2a9f128a530aaaf6e5d4a34a2839bc6c398 SHA-256: f03b8e5faac4083375a5d67da911d7eaac57304a9da831f31ead2607a00204c1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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/award?keyword=electrophysiological+foundations+of+cardiac+arrhythmias+pdf PDF link annotation
    • http://carins.info/wefunepufevig0zd7i.pdfIn PDF document text
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/befisapelateke-jobafotumugudep-xuvubamuna.pdfIn PDF document text
    • http://hookup154.space/676767589007rtpb.pdfIn PDF document text
    • http://peskomment.ru/how_to_use_casio_fx-9750gii_for_statisticsm69wq.pdfIn PDF document text
    • http://bloomwithdeanna.com/78082014675av16v.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/nolovexotaku.pdfIn PDF document text
    • http://prostotit.site/suxoseyqhz0.pdfIn PDF document text
    • http://9gusevshop.space/angamaly_diaries_malayalam_movie_400z177d.pdfIn PDF document text
    • http://wegansit.space/after_life_2009_full_movie_free675ew.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/6820452.pdfIn PDF document text
    • http://investmag.org/the_monkees_daydream_believer_lyrics_bersetzung11ldc.pdfIn PDF document text
    • http://dithetsen.xyz/mercury_7.5_thunderbolt_weightukbvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b59097d-d28f-4719-a5be-7f4d34c11fab/32820493049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20aae6b-3413-477e-b5ce-36f598f2c7fc/fotevigipemaf.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_10a65ecb327f41aaa8305182cb64e11e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4811036-28f6-46b8-9d28-7220fae64a23/some_advantages_of_sexual_reproduction_in_plants.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_7ed29e9c037b409089f57127204cb7ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6232a9-70aa-46d6-98fd-99d8dee50955/how_to_check_balance_on_regions_visa_gift_card_target.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_629ab76b25d14cec8bb0b6c61a3d3b74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/paper_chromatography_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abde862e-42eb-4e0d-9b16-c6df5970edef/adobe_photoshop_elements_2020__premiere_elements_2020_bundle.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_91f80fb97a7443009d24205b5ec98bb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/nenimiropidakuz.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_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 3252 bytes
SHA-256: 5c65d6971ccb3be48f91491e60a19638be924b9b92a3d67bc327e5531c0df02e
font_01_sfnt_off00015982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15982 5628 bytes
SHA-256: 04b8f6b3bb1dbc8daac4165e55b0f113084cddb158ca93084c612a5c91188e2a
font_02_sfnt_off00016c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8D 11492 bytes
SHA-256: 7d3a2faa5a51bd529ba88a5aead3113a8c0b3c1d83a104c2cd5ce3670ae12c21

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