Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95a346f0593b02b…

MALICIOUS

PDF

74.9 KB Created: 2021-06-06 17:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99afa996db24797b46a3d600ba32ddf3 SHA-1: 5303a75c53b224cf9c223f19eb72b807c9f2b824 SHA-256: a95a346f0593b02b577c99ca20a7b2631eba021904b5b769528b5fddda20dc22
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=q+connect+labels+16+per+page+template'. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=q+connect+labels+16+per+page+template
    • https://cdn-cms.f-static.net/uploads/4464534/normal_603e3e04a0aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fda3fc72e64d.pdf
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ff6be374142a.pdf
    • https://cdn-cms.f-static.net/uploads/4460446/normal_6034d139965ec.pdf
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5fcf89a30442f.pdf
    • https://cdn-cms.f-static.net/uploads/4411493/normal_6028f8cdcd93a.pdf
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fed155df349d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saladolu.pbworks.com/f/7.snf_ingilizce_ders_kitab_cevaplar_meb_yaynlar_sayfa_78.pdf
    • http://fepewuwakow.pbworks.com/w/file/fetch/144484092/40451945830.pdf
    • http://jilawuxifi.pbworks.com/w/file/fetch/144595341/5793951883.pdf
    • https://uploads.strikinglycdn.com/files/a4a389b9-8f42-4893-ae5a-4397ca4dd186/what_length_ice_axe_for_ski_touring.pdf
    • http://xojifot.pbworks.com/f/pudivi.pdf
    • http://nubuzefi.pbworks.com/w/file/fetch/144603843/need_for_speed_hot_pursuit_story_mode.pdf
    • http://vifogajo.pbworks.com/f/88474077184.pdf
    • http://nixefijevumu.pbworks.com/f/28730481529.pdf
    • https://uploads.strikinglycdn.com/files/bc8b327a-a1a6-40a3-ab3d-0da55fd74caa/59630891605.pdf
    • http://wesupumus.pbworks.com/f/four_assumptions_of_cost_volume_profit_analysis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20f.bin
4b8104be27f23fafe43fac19c49ffa2546c5b459e1c2e366ad182b103432f11c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5660 bytes
font_01_sfnt_off0000f535.bin
ef32acce1dcb81ccf0eac73d45f4c125f6c4522448e0b010edb7844406c450f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 11612 bytes