Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aec861444a981d…

MALICIOUS

PDF

72.2 KB Created: 2021-02-13 19:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e91e573fe30ba48e84f7027198dc734b SHA-1: 5041edc0ae7ad8becf66caecd819201d3df3322e SHA-256: a5aec861444a981d2838b689bfb836fc5964c1e9c5a37bce1fd30a082cf856cc
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=gcss+army+overview+test+1 In PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/83a5c1d9a26.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/fajemagukawebated.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/8111714.pdfIn PDF document text
    • http://abanca-electronica.com/adblock_plus_apk_premiumibzdx.pdfIn PDF document text
    • http://vinograd.io/excel_vba_for_dummies9zxf0.pdfIn PDF document text
    • http://damvglaz0.xyz/business_case_competition90e3t.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/c1813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5fcf27b50ab46.pdfIn PDF document text
    • http://vekvelo.ru/35002934472uda96.pdfIn PDF document text
    • http://big-ita.space/download_samurai_ii_vengeance_modxvduu.pdfIn PDF document text
    • https://kanevedodusuwa.weebly.com/uploads/1/3/0/8/130814441/juwidagiwawad.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/futex_jutiwoda_piwafubolal_punonodibivagi.pdfIn PDF document text
    • http://meveteletav.22web.org/76208681084.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/jasadavebaga/afmg_ease_manual.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/buckner_mo_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/mebopekatidesamaw.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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5248 bytes
SHA-256: 5215a366d6331f0bd2171168f312f63208a9fc2810b2a89e3a4b1f46e4820f50
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 10360 bytes
SHA-256: a25f7b9d1266cdc5444ddeb9fd0acb4d17d655178a6ba65c8d8cf600e395cb1c

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