Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e7d6b641fb372d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-21 01:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3125a2860772031ce6a31569045bcb13 SHA-1: 578309c6530a4cb364c20a8dcd45d60520ca13f6 SHA-256: 59e7d6b641fb372d1d4127accb0def6d6350413cc70dfec0a7942372dabb6b34
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://botokaw.ru/award?keyword=paper+briquettes+pdf PDF link annotation
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/kafoliluz-tatimabivisik-wejitoji-diret.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/fBhcfgf/buddy_toss_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/ggjegeo/pibitejudejumejinipadebuj.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/1208150.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/htlKje5/mercado_pago_usar_saldo.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/8546340.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/wRgYjeX/36809850698.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/htbdhgb/best_slashing_defender_build_2k21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96f7e05-d404-42ca-b13b-91c74b25d608/craftsman_kohler_pro_26_hp_v-twin_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83057a45-2f18-4854-af04-6d223f1de0b7/tuning_fork_frequency_sound_wave.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_fa5799cb82a74afb944b1a0d9740ebd2.pdf?index=trueIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f053bcbee9d64811a030ad043f671dcc.pdf?index=trueIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_53bb1c2a5d3c4fe68497e3e744c511bb.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_bd0ef8689cf34f75af36a47bb24070e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6478a55a-525a-4120-9725-d01bfc648cb6/samsung_tv_service_menu_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a05793bb-e08a-4ebf-9ac8-7a18b18cbd76/what_does_electrical_engineering_mean.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_002b6c2e797a460e8b22f95166f67488.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/286b9516-5499-40ee-881a-bc73473929bc/dr_browns_bottle_warmer_e1_error.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_92a9d2504dbe44c8bce7ca7a08ce8d6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5e5742-03c9-49f5-8a5e-c33b8a1f42f2/tcp_ip_ports.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 5520 bytes
SHA-256: e82c5ffe3c427524ebc9d5503f7ba7189940aac39c1d0151bef7e1534b0fed0f
font_01_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 5272 bytes
SHA-256: 84435f7db07474e7e75e4d470967b3d9f304f386b34f91b3bf24cd3ff412e22d
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 12216 bytes
SHA-256: d4ec108a9c3cd81654054e31d8b0c0c87b490b0dc72e9ef67f275998ec53007a