Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b14aa66e5eb89…

MALICIOUS

PDF

72.3 KB Created: 2021-03-14 07:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a1861a28922e6e1a92db832497ce0a1 SHA-1: 7505121897521729872b85ad9e447f122028d62e SHA-256: 671b14aa66e5eb89f01bb9dff9086648cdd44638c0a8be6944cb55f828fffc6c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI actions are indicative of malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=oscillatory+motion+notes+pdf
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/rimaj.pdf
    • https://cdn.sqhk.co/soxuwutitaw/j7gdbTL/13229387989.pdf
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/moridubuzojuf-darexosanimuf.pdf
    • https://cdn.sqhk.co/poxedomeke/cOGsRgj/lufibakew.pdf
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/perilazuneti_lusavosimab_zazugota_xaxoregebegilid.pdf
    • https://degebemug.weebly.com/uploads/1/3/0/8/130814630/4349265.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/5369633.pdf
    • https://cdn.sqhk.co/wiradimabid/ojjekgd/baixar_shark_dash_para_android.pdf
    • http://majexifavel.scienceontheweb.net/mechanical_engineering_projects_on_heat_exchanger.pdf
    • http://adanakebap.org/adobe_acrobat_pro_for_maci7hkq.pdf
    • https://sapesikunudob.weebly.com/uploads/1/3/1/3/131398489/xatimerumiva-jeletumegus-daronasejer-kepegazefixadir.pdf
    • http://lukiduxipapep.mywebcommunity.org/luwupijelodes.pdf
    • https://cdn.sqhk.co/xudogafu/jcWRhh9/38766431379.pdf
    • http://frasqen.online/6244082811071swh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wutesejib.onlinewebshop.net/how_to_do_master_cleanse_diet.pdf
    • http://sanugifop.atwebpages.com/square_of_numbers_from_1_to_50.pdf
    • https://s3.amazonaws.com/lupuvogotog/huawei_software_update_tool_free.pdf
    • https://s3.amazonaws.com/donukadizolin/4g_lte_switch_free.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_off0000dd38.bin
cc2f4b2e839af00720484d018c49630ae538e9a1edfca9bd3ac79c7102dab2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 5432 bytes
font_01_sfnt_off0000efa4.bin
a441cb91cb9b2eb6b0a41e366a3aecaff4c633c320bc3284711dededcedc9394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10508 bytes

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