Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4c4e775a88d8b8…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 02:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a69dafb8c4147862de08c71bd0b4515d SHA-1: df18257b2ce01ec332ec89e2804813926e26c6eb SHA-256: eb4c4e775a88d8b8630f42cf80d1dfc95a98e6c1424dbb5c5551146dbe41c73e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding of a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be redirecting users to external sites, some of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dafemum.ru/award?keyword=bet+angel+user+guide+pdf In PDF document text
    • https://cdn.sqhk.co/tatidukigag/ev4ribj/star_traders_frontiers_save_editor_android.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/molerejovopu.pdfIn PDF document text
    • http://losqutoq.online/carta_de_verificacion_de_empleo_ejemplofsdsk.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/8044895.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/Lqxhegf/guess_the_movie_emoji_quiz_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/itvFRgd/51425289168.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/wgdduHj/game_center_ios_sur_android.pdfIn PDF document text
    • http://monoga.space/91556288518ttigs.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/bhdjdO4/zejiparave.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/iKFYB1o/54571343455.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/gizIhRj/poe_elementalist_carrion_golem.pdfIn PDF document text
    • https://cdn.sqhk.co/venujotiwufo/ggjgdrc/jelaxexulitejolejise.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/ab40ec1.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/5366471.pdfIn PDF document text
    • http://gatorama.site/kitchenaid_gas_stove_with_double_ovenu3v1t.pdfIn PDF document text
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/gazogowakuxobegeg.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/bifo5VR/40231864130.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/iaS8hgw/32323228905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_21fcdc6994a04d06aff09ab804e1b82e.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_7bdf890e1a7940c28831020fc0d83c18.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_9d94b28e167a46fab063aeeeb88e74f3.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_deab2694b04a4f95a27450c29fa4536b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/wawasafodifaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/jurnal_fraktur_antebrachii.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_523e3eff0a5844db90eee6450dd9b8b4.pdf?index=trueIn 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_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 5260 bytes
SHA-256: 97ad9496e972a75969a21677659e12e4f4c8b6af46fe7f6a7d1f20f507d8cdff
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10836 bytes
SHA-256: 7d7492bb2de958d36e58af08e81e1479ed5d870f8281935ae4a0b09a54c1a223

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