Malicious PDF — malware analysis report

Static analysis result for SHA-256 7964b9f96ebd08e0…

MALICIOUS

PDF

106.5 KB Created: 2021-04-06 11:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 57ff7e52fe006e93c70cd4d6bfd6bfac SHA-1: c82c29ca3183e56e6ee0726e6edbaa4a51103200 SHA-256: 7964b9f96ebd08e06642b9c6332f80edd7f18b7d0c2017a5af92422a50990f3b
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm on disposable hosting', indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download of a second-stage payload via one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=building+materials+short+notes+pdf PDF link annotation
    • http://dfwshootersupply.com/solinexet20.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/jghjhhd/junize.pdfIn PDF document text
    • http://pumba.fun/independent_contractor_agreement_template_nz3e62n.pdfIn PDF document text
    • http://adminhalil.com/1996_ford_f250_repair_panelsgn5is.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/8VBFjhc/rush_limbaugh_podcast_youtube_may_23_2019.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/xisunudilu-zatuwugos-litatalupak.pdfIn PDF document text
    • https://padamiraniz.weebly.com/uploads/1/3/5/3/135305831/rinawet.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/filagon.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/Ohihfyf/m1_prepaid_check_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ia6rhdq/tadamezezukulofovadab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_605817180a13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_605f278d634fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_60430bf88df62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393762/normal_603f4deee3704.pdfIn PDF document text
    • http://fito4ka.xyz/warhammer_40k_8th_edition_rulebook_downloadcrufj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ff1e69501ad1.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/9qtmhdq/49846623809.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/6f1f307d-7224-40af-819a-66ba16b7dfe8/toro_weed_eater_fuel_line_routing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcff0ad-8b82-4df6-ad32-999b3397bda7/after_we_collided_trailer_release_date_us.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/nufupodumijorumibalevij.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/kobolds_and_catacombs_guide_rogue.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/lelanavagajojuzovub.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/vebisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8277ced8-fb0a-4fdb-8922-21d1b11da33d/binujaxojuwogajegokok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea6357c-9b64-44bf-97aa-c55b58fad7df/samsung_hmx_f900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f9db3c-c555-48ba-816c-2d7bb0c6ecf3/ways_to_sleep_with_a_broken_femur.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_off00014b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4B 6200 bytes
SHA-256: 28b566212c923c92f32dd5a25ae8179209b6f181517ad6fb74e474942db12c94
font_01_sfnt_off00016067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16067 5504 bytes
SHA-256: 2ee1d713f316507a84014c0d1a40a3ea583f0c3c581c6b44005f0836551a0097
font_02_sfnt_off000172f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F1 12176 bytes
SHA-256: 3c556326a1f825c1db124dcf5fb2a42ac7833d3bcde42b08dfc7ca716d96f386