Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6991659dae0458…

MALICIOUS

PDF

77.1 KB Created: 2021-06-09 03:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e72e5620d0d43f7089911db3bb48c6 SHA-1: 7a091b7f484111bfb1acee9e74d10bf6538f52ca SHA-256: 6c6991659dae0458a56de5e62fdf998424439eb4a2936c5bed4259e5f88e2320
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially malicious websites. The embedded URLs suggest a lure related to software downloads, such as 'stata 16 free download', which is a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/pbw?utm_term=stata+16+free+download
    • https://cdn-cms.f-static.net/uploads/4470221/normal_605ad9c0f2e6c.pdf
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6045ec133ef6c.pdf
    • https://cdn-cms.f-static.net/uploads/4388037/normal_60328fbc3851a.pdf
    • https://wedisojurul.weebly.com/uploads/1/3/4/5/134515344/dugebux.pdf
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/walivewuse.pdf
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6027acbcdb370.pdf
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/4449842.pdf
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/sesarikapidi_maxotavejani_japavubipa_tufomaxasekikud.pdf
    • https://rujabeta.weebly.com/uploads/1/3/4/5/134529194/lavavutalarelez.pdf
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/larin.pdf
    • https://cdn-cms.f-static.net/uploads/4453729/normal_60667bfd5528e.pdf
    • https://cdn-cms.f-static.net/uploads/4453718/normal_6048635a2b8bc.pdf
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/tetidegigadiw-lolutotow-kugarimanosal.pdf
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5ff21a6dbde10.pdf
    • https://cdn-cms.f-static.net/uploads/4471230/normal_601133dc31204.pdf
    • https://garizoruzaxa.weebly.com/uploads/1/3/3/9/133986237/gobadepavozolinexip.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_604180d31fd50.pdf
    • https://cdn-cms.f-static.net/uploads/4445729/normal_60468c7750a0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ziludezubeju.pbworks.com/f/avatar_a_lenda_de_korra_3_temporada_dublado_baixar.pdf
    • https://uploads.strikinglycdn.com/files/dc822503-f1e5-4b1f-b741-fddb7f1e983a/78460425724.pdf
    • https://uploads.strikinglycdn.com/files/d22e4f38-c310-4fd4-abe7-bd62441171ac/ryobi_drill_press_review.pdf
    • http://xinunubaz.pbworks.com/w/file/fetch/144623697/68689927997.pdf
    • https://uploads.strikinglycdn.com/files/a5eeac6b-7559-428b-8347-b685eb8ea1f5/tizigenom.pdf
    • https://uploads.strikinglycdn.com/files/3f97a468-e57c-4190-a62c-a4e514b1454f/el_dador_de_recuerdos_capitulo_2.pdf
    • http://lipemuv.pbworks.com/w/file/fetch/144774213/54679889610.pdf
    • https://uploads.strikinglycdn.com/files/8ac6428c-22c7-4639-a3b3-27dd0f67c177/wagner_w15_steamperfect_wallpaper_steamer_review.pdf
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144485544/58592887800.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f140.bin
79ea727673d67bc138ccc6230d8452f4155ebccfd80a61abb8eea72298bebc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 5124 bytes
font_01_sfnt_off000102d7.bin
14158890f5c1665a3c3eb77e99fc364fb85e78c58e5512c6f62b6a579b594fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 10368 bytes

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