Malicious PDF — malware analysis report

Static analysis result for SHA-256 14badfd0694c459d…

MALICIOUS

PDF

73.0 KB Created: 2021-02-21 20:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d7a7020c3c593f74b6e8bfd7c272631c SHA-1: 68f40630743b98c67b525bbc97cb9d845dccec70 SHA-256: 14badfd0694c459de45e526dd73a0d0d118f6e96956204150a63c5272e03c5e6
164 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 are likely part of a link farm for SEO manipulation, as indicated by the PDF_SEO_LINK_FARM heuristic. The SE_INVOICE_LURE heuristic suggests a phishing or scam pretext. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classification strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/wix?keyword=riverside+county+paint+disposal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443326/normal_5fe7a11ce910a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_6026816d3ee0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe1d1dd154ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fe4ff938ec31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486221/normal_60278f50da399.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/5164179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff310898592e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_60314285e1b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5feb64e11d93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_6032830dd62c1.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/zufaxepixiguxax/can_u_use_apple_airpods_with_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/cartoon_online_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/bhairava_movie_songs_in_kuttyweb.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/flipkart_guess_what_answers_24_april_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/59481548671.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/ion_grid_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/what_is_the_difference_between_a_short_story_and_a_novella.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/acls_pretest_2018_answers.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 5236 bytes
SHA-256: ae4bd0b73171fa540c20b79e0f900df14a535e76b45ab70ee4cbb94fba5f3751
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 11116 bytes
SHA-256: 7e91e2aab62ee0eabb617f892c3dfff32444d325c7077900f8ee7de901adb5ff

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