Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2a19861113ef44…

MALICIOUS

PDF

71.5 KB Created: 2021-02-13 03:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7182d742ee7958e0fdbc4d7871913a5e SHA-1: 046be18c210b23516a1ec00c0a24f911a6090d0d SHA-256: aa2a19861113ef44a0b3493ffd584bfd48fc0fc4b2b2a1ca5ba0098eb20d085b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The document body text appears to be obfuscated or corrupted, providing no clear thematic content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=say+it+with+symbols+investigation+1+ace In PDF document text
    • http://lidedapomegila.iblogger.org/appendix_or_appendices_in_a_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451954/normal_600c58f1592c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469645/normal_5fe29c7a003e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fed14ec3cc11.pdfIn PDF document text
    • http://everydayy.fun/44216281341rmbip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_601d695b30611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_601ef9ebc15b2.pdfIn PDF document text
    • http://difemetudanad.22web.org/bookworm_adventures_2_free_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478933/normal_5ff581fad67f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofufedufis.rf.gd/biodata_format_for_marriage_doc.pdfIn PDF document text
    • http://ledojiwibobuva.rf.gd/2605437969.pdfIn PDF document text
    • http://xeravujowa.epizy.com/loxemaxoritererufosinizim.pdfIn PDF document text
    • http://julizut.rf.gd/andien_puisi_jikustik.pdfIn PDF document text
    • http://vaforapibasaw.epizy.com/come_back_to_sorrento_violin_sheet_music.pdfIn PDF document text
    • http://tapavakagazu.epizy.com/baby_sleeping_bag_temp_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46F 5668 bytes
SHA-256: 298cb574f6d5a6a4c1c08b3128c3337ac93d5b57066a466e31cc2783be73ac12
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10128 bytes
SHA-256: 2420dbbc5b50869738c9b15c81b1672595b6d415affdc41115119797edbdc1e1
font_02_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 17048 bytes
SHA-256: 7388dd93f5d64c650e9731e9fa97a1e0fa5bb4dced98ee3e73f5ba22376176fa

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