Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3f94132151aa8a…

MALICIOUS

PDF

92.4 KB Created: 2021-03-13 22:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b3f0a99d4208d28775645fd76d3d48c7 SHA-1: be6bb5ef8243bdc07fba7c62243feaeebf71700f SHA-256: ce3f94132151aa8a9c274e6292d4e931adb24f2bbb3e39112ee063782c4f2612
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://bologen.ru/award?keyword=beta+probability+distribution+pdf', which is likely part of a phishing or SEO spam campaign. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest malicious intent, possibly involving embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/award?keyword=beta+probability+distribution+pdf PDF link annotation
    • http://kafixerutatad.iblogger.org/alarm_clock_android_app_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fazitewem.rf.gd/gidemewinufebatebulawaru.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_850fc036afd94181a922e27bea595fb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/nevakamanajogedakilukafir.pdfIn PDF document text
    • http://xexazopaxabet.epizy.com/dujivopepak.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_afe33396232b4d5597dc112b4f4dd34d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozaponi/39109654329.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/control_system_theory_book.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_a2670e2a2f714e7f842c89c7a69d4cad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/63218334467.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_ef881bc717b14e0baf8995d7d3d1b777.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/referee_report_economics_sample.pdfIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_c6ac5a9f32b8408baaafcc6de61a3d5e.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_29a3127278304d1695b7847263aef031.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_4a61747e416143b69b6f1ee273d989ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/povuzituxegelaja.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_0dce8183504247e09744b39d2febc1e7.pdf?index=trueIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_0cf83db122524ed39e9ce9a1141499f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/sajusowamogusupamemi.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_3deb0db76f684c20bdd30a3105f0f10e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/5v_audio_amplifier_circuit_diagram.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_5f5916aec10049a8a77f60682391d3e3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 5208 bytes
SHA-256: b72d1ff0390f4bc23313461c8d85f73dc970da5836a3b6a19987127b1d1c6e5c
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 12716 bytes
SHA-256: 57e2d52c3e5fca730ebc2d472053f65ad31689f527982733cb25a34d9237759e
font_03_sfnt_off00013f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F29 16380 bytes
SHA-256: 00340149654246ae2fd26c39aff415ed4b895f43f7df1f446725b99aab651128
font_04_sfnt_off000154df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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