Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb031dba56bdd424…

MALICIOUS

PDF

70.3 KB Created: 2021-02-28 05:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9aae69fb85bfce2ed71183f51c619ea2 SHA-1: b6c79f75c877b4151235b009ca2af12107aabc6e SHA-256: bb031dba56bdd424bc0a2e6bf1d3526d20ed0dd7c88806a2863650f300240c58
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links and the malicious redirector suggest an attempt to lead the user to a compromised or malicious site, likely for phishing or malware delivery.

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
  • 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 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://dafemum.ru/aws?utm_term=hp+officejet+4500+ink+not+printing In PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/sojod-xarunamafizov-bomasafut.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/5265023.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/descargar_audio_biblia_reina_valera_1960_mp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_6000b942c6b55.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/7ef828.pdfIn PDF document text
    • https://xatikofaf.weebly.com/uploads/1/3/0/8/130814669/9925074.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/wazafo-wutuvusugasejis-taxabun-perow.pdfIn PDF document text
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/sinapezefabud.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/bisapovepizaj/how_to_decide_if_my_marriage_is_worth_saving.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/little_britain_episodes_guide.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/wezekujimaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/joxuwajurelesojofu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/39709461336.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/beginners_guide_to_fishing_rods.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/vefawuronilelesizeg.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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 5220 bytes
SHA-256: 0b09174d8e340744e791867382216c4d3d4b9fdede1d9a1e5cc8cf6e466f7854
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 11072 bytes
SHA-256: b5cbeb60dec64c6d524cd367c323a4a6c1b2e5040288cde5afc8430ea4e43828

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