Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f87ac03f1dcceb…

MALICIOUS

PDF

72.5 KB Created: 2021-03-30 06:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c18263023f263e01b1c3da5a6fd2e14 SHA-1: 7d1dcda61c659d233522d35dc1c5ec330c60470c SHA-256: 82f87ac03f1dcceb2c3a410951a172dd6019eb7ad05a2788d4c2d54d0d2b05ed
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are disguised as SEO-friendly content, suggesting a link farm or phishing attempt. The primary URL, 'https://resalured.ru/award?keyword=learn+biblical+aramaic+pdf', is presented as a resource for learning biblical Aramaic, a common lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=learn+biblical+aramaic+pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/4365403.pdf
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/ccf4ccda52be69.pdf
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/1616893.pdf
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/9863321.pdf
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/5761513.pdf
    • http://monabis.iblogger.org/java_8_lambdas_richard_warburton_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zijivevip/comptine_dun_autre_t_piano_sheet_music.pdf
    • https://s3.amazonaws.com/mufukep/cisco_ssl_vpn_configuration_guide_asa.pdf
    • https://s3.amazonaws.com/numunenoji/tadevafidirelituzal.pdf
    • https://uploads.strikinglycdn.com/files/e2e44bf0-a8b2-4d9d-be4b-fefe3b8a23c9/ikea_flat_pack_sofa_uk.pdf
    • https://uploads.strikinglycdn.com/files/febb3e9b-3419-4ec3-afc6-6eac2e03f77a/aston_martin_dbx_engine_specs.pdf
    • https://s3.amazonaws.com/midipes/free_android_spy_apps_whatsapp.pdf
    • https://uploads.strikinglycdn.com/files/571592f0-ea7b-4197-8570-f7c1b7cc947b/28967541099.pdf
    • https://s3.amazonaws.com/zemunomipazikez/95495562126.pdf
    • http://xutulatovemi.epizy.com/hernia_umbilikalis_adalah.pdf
    • https://s3.amazonaws.com/povodijirig/archeology_merit_badge_answers.pdf
    • https://s3.amazonaws.com/nijudow/kedapegobowufobavukuguwo.pdf
    • https://uploads.strikinglycdn.com/files/5419f6cd-3bf9-4e97-8088-97aad360cba4/jigawomomutaletolufa.pdf
    • https://s3.amazonaws.com/gebukil/45293397308.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d604.bin
2366cdf1141c117b0eb88604cf1f083eb39fbf312371e7f77d1c7e63165047fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 5204 bytes
font_01_sfnt_off0000e79d.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 1800 bytes
font_02_sfnt_off0000f02b.bin
a0af74027a793041dc864be63fff7602ad0c5b418a26bde949354bc3feae502b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10660 bytes

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