Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55164f0201f216c…

MALICIOUS

PDF

74.8 KB Created: 2021-02-17 11:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02f05c1ee5757a5b796e41f0eb82b1d2 SHA-1: d50d45b4b9fe4da67bb9419058b9da450bc16f46 SHA-256: f55164f0201f216c8b58c6117dd00914886a4494c3cdf955bfb00467a4976744
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://maypoin.ru/wix?keyword=prentice+hall+conceptual+physics+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/kurinunuwor/7ZwggzT/xiremukekugezatotojel.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/cJtYDjg/water_slide_jumper_for_sale_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fe278b4ae769.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/7221944875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6024b685ad24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_6021bd7d9f2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/fXXjajs/78112540780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501231/normal_5ffba4db97c83.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/kewugapedokuwavoxekax.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/ia3Khgb/rolujusujulefalamivem.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/hhgBNhh/gufegigogupapejimufemupu.pdfIn PDF document text
    • http://zobebukore.22web.org/arsenal_vs_tottenham_4-_2_highlights.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/faduxodiwo/gipifazopawexevadowi.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/global_peace_index_gpi_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/xemevobesaxedidas.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/loxakevebezepes.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/how_much_does_photos_cost_at_walmart.pdfIn PDF document text
    • http://sikofus.epizy.com/latest_news_on_nigerian_army_recruitment_form.pdfIn PDF document text
    • http://zogutofarori.epizy.com/antichrist_full_movie_in_480p.pdfIn PDF document text
    • http://wikiwujekuloxok.rf.gd/8023346745.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/21946665798.pdfIn PDF document text
    • http://zaximibirada.epizy.com/kudivododoxaliru.pdfIn PDF document text
    • http://kazaxese.epizy.com/bugamekogamox.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5436 bytes
SHA-256: fad79eabff571105dfc8258acdd0afe3446a7807361bd697e2c43f8b77d2c5a4
font_01_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 14344 bytes
SHA-256: 821e0369dfcd9143c4b6a8149c58bb3689e45d57d983a4723c49962f5090b479

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