Malicious PDF — malware analysis report

Static analysis result for SHA-256 4972d080f67bf3e8…

MALICIOUS

PDF

82.5 KB Created: 2021-03-03 07:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f76e7431eda6ca1f7844eb5f7917fdbf SHA-1: 88cfdbee1669bcb8e6bce6c730f32303a4bb3061 SHA-256: 4972d080f67bf3e86ae084551d4e3b37360933212091e90cd276b29538169af6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/123?utm_term=how+to+install+ge+profile+microwave+trim+kit PDF link annotation
    • http://nejupike.mygamesonline.org/fifty_shades_of_grey_full_movie_2017_trailer.pdfIn PDF document text
    • http://info-pages.ru/music_sheet_holder_for_casio_keyboarddp0ch.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/6d829.pdfIn PDF document text
    • http://girlita.space/deledazigubelubokido6ac6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fe8a85bddf1a.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/9039578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_602b40f8ca3f4.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/jibajosatutuvilan.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/fuzux-sutujeme.pdfIn PDF document text
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/mewarunakazu-moweguruvoj-rilamusesu-gibugawuxesuri.pdfIn PDF document text
    • http://rubka.space/moon_river_ranch_austin_texasc8tam.pdfIn PDF document text
    • http://instapriz.site/how_to_pair_nakamichi_tw211m8801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_603a198b28e67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://govodotogogot.epizy.com/john_deere_7000_planter_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/3d_architect_software.pdfIn PDF document text
    • http://sojizodujibibo.epizy.com/wapking_ringtone_kabir_singh.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/4512131204.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/92229245146.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/80978623517.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_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 5512 bytes
SHA-256: afbeb5649b9aed5ddcd97d00e0c0a5f5cdc3815a68f22991cdd569132a37a548
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 11012 bytes
SHA-256: e687da0711283442a1437314f22319167308f310111e94e70b0b707def229c3d

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