Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3def27e93e837da…

MALICIOUS

PDF

86.5 KB Created: 2021-02-03 18:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dd48c8fbbd282f4755415e9285c03d9f SHA-1: 9b55b10b993011805002e0b23fd025ba83a9cfc8 SHA-256: d3def27e93e837da2f7f9728ca3cb92155c56510908f2c549fd57ab0e1768df2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests an attempt to direct users to malicious sites, possibly for phishing or to host further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/123?utm_term=hartford+fair+2019+pa In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ffe915a78940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fe259f665065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6012565042844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_600d6839c5bc6.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/nosojuvabenoralufaf.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/zujulelomifujoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5ffa7a7374ce1.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/8308091.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/hjiija9/19482078269.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/cghhhiV/how_to_make_in_little_alchemy_life.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/heichih/turomavuwoborejofalaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/58822839160.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/52232876867.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/trivium_ascendancy_full_album_rar.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/answering_service_care_careers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/rofikato.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/bajrang_bali_dj_song_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/english_speaking_guide_st_petersburg.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/can_a_former_employer_bad_mouth_you.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/nurijizimuxevurenot.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 5268 bytes
SHA-256: a91810095fe491b134c2c91273f718329ef30aefcb90688735fee21d7c392c97
font_01_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 11024 bytes
SHA-256: b551b0eb24be197722b2ee87c89b7de6ad0faa8e8a024e9562d3851a22eb1cb1

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