Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffb6f80deedda6b…

MALICIOUS

PDF

116.3 KB Created: 2021-02-26 12:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ff5f1c8a1c50a2f0306800c5b88dea77 SHA-1: 5dee6b1c16e23f06f811dc5023a308af16c99da5 SHA-256: 0ffb6f80deedda6b9f254aeb4df8aa38bccacfb688ad4b922677c89f3fb2c0d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://nipisod.ru/wix?keyword=go+math+grade+5+chapter+1+test+answers', is presented as a search result, indicating a lure to a malicious website. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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 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.
  • 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://nipisod.ru/wix?keyword=go+math+grade+5+chapter+1+test+answers PDF link annotation
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/giwumibosoli.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/laptop_price_in_nepal_acer.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/82881803664.pdfIn PDF document text
    • https://mawosamaretezij.weebly.com/uploads/1/3/4/8/134860838/peboxuk-gibexadizemilag.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/20e10fbe5749a7.pdfIn PDF document text
    • http://fb-ig-copyright.com/asus_command_softwaregvmcs.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/righhge/furenapizudi.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/gVijIgg/vaxenojoxute.pdfIn PDF document text
    • http://yourbigdick.space/muzuvunulapx5y29.pdfIn PDF document text
    • http://knitfqph.site/38475071730qm2bk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_603103626bd39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/2018_oscar_winners_list.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/fezuxalepawobu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/53717626296.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/psychological_assessment_notes.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_off00017d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D15 5492 bytes
SHA-256: fd8d1ec61276a95997fd208c7547550a8fc59909ee44b4dbf89d08c9b081da6e
font_01_sfnt_off00018fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB4 11184 bytes
SHA-256: 03fb909e0dda8228c237bf0b9c9a55f9718de23b6730c248f29266429ef7cfb1
font_02_sfnt_off0001b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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