Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f0deb9aa27e8b1…

MALICIOUS

PDF

79.8 KB Created: 2021-04-02 00:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3f14a53db738ce658e6b56c137d6f0b SHA-1: da6940d1d94ae106d4150b1de45e115466e14b22 SHA-256: a3f0deb9aa27e8b17b9616e28a9627cd3f2df5a4929b1c8087961ec6c1948bf1
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to development milestones, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=milestones+of+development+pdf In PDF document text
    • http://thedopemarketing.com/65962329295gqz0i.pdfIn PDF document text
    • http://wordsidepost.top/how_to_add_paper_to_canon_mx922v3dpn.pdfIn PDF document text
    • http://stankovit.ru/how_long_do_beats_solo_wireless_take_to_chargeofhgx.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/hhuifjh/dj_apps_2018_new.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/igNPCib/ebay_auction_sniping_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/bZvoggp/extreme_landings_pro_mac_crack.pdfIn PDF document text
    • http://help-copyrightservice.xyz/how_to_enable_local_area_network_in_windows_10cnmfk.pdfIn PDF document text
    • http://poverkavoda.website/the_hydrophobic_skunk_answers_long_responselfr00.pdfIn PDF document text
    • http://usesalle.xyz/potabelebafeba5bz01.pdfIn PDF document text
    • http://autoport76.online/datoniwufozewenwp4d.pdfIn PDF document text
    • http://distornyup.site/154643101425avo2.pdfIn PDF document text
    • https://cdn.sqhk.co/wewutivuv/gdepU6e/chocolate_reaper_pepper_seeds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/41268258658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5919f9e-8ef9-46cd-901d-029471743f9f/86981917962.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_bb0280548f1540babdc6cb7dd4306d0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca593aa-76fe-4752-a90e-6ed6c6e121a9/what_is_expense_to_revenue_ratio.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_07772e1c9d7e43b8b922ff08ca90d045.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/10292245709.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_2337fc41e7154baa9cc44e7570994f74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2562e750-a4f3-4cf7-8ccf-b89cb5a39d77/the_best_keto_delivery_meals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4e6f09-cf2d-42a5-9a48-e5de0f6d0ad1/libro_espaol_primer_grado_lecturas.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_7244e73b0e7f483b84d6ea70abf51c09.pdf?index=trueIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_3fcf91ddaddd486494dcd94419184c4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/unication_g5_pager_tones.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/quickbooks_online_expense_report_by_category.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 4944 bytes
SHA-256: f55b733aed5da89b3f84a797a86afb74bb3b18a0e1e7b84b0f58699f642e3126
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10780 bytes
SHA-256: 19b567175543bc93b82e4f1f36fda98d0667949302a88d5d122e009d5c339272