Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c91f7c44b21959…

MALICIOUS

PDF

80.0 KB Created: 2021-03-12 11:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a311704e1ff2373ca3c6d4ada8f1e321 SHA-1: 4f127cd0c1a887746f1b98ae808bcbcbc82f2821 SHA-256: d1c91f7c44b21959f0326d869686326f73020a0c5c4d87b7dddab29abb6e7259
134 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one pointing to `https://jacksth.ru/wix?keyword=thai+lottery+result+chart+2014+full`, suggesting a potential phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/wix?keyword=thai+lottery+result+chart+2014+full PDF link annotation
    • http://xexapitanegis.getenjoyment.net/47992371324.pdfIn PDF document text
    • http://fuxivipusutipu.iblogger.org/capacity_assessment_form.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/dictionary_of_political_science.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/creative_writing_internships_summer_2021.pdfIn PDF document text
    • http://watulexop.iblogger.org/making_comparisons_in_spanish_practice_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5e3e69-a363-416f-acc7-8ddd0f40f536/how_to_animate_2d.pdfIn PDF document text
    • http://zotuzibufuvonif.rf.gd/samsung_un55h6350af_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1a3c25-c72a-4ba4-a7c7-9dddf090bcae/bakoxavonutep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b298bce-8b13-4c9b-9b4b-166ef4d5d744/what_is_the_best_27_inch_double_wall_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66697ad-6e53-4f39-a3f7-3bbcfefe7333/fodadedebafumabekuvatasa.pdfIn PDF document text
    • http://monuwuwotivonil.epizy.com/36956287372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981dc100-a8c0-4241-b95c-877ace435727/how_do_i_update_my_kindle_fire_3rd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a655640-ab24-4164-a295-7e2f3c186287/examples_of_cloud_computing_service_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dad741-c503-4cad-bad3-b0c1a761dc35/6726597566.pdfIn PDF document text
    • http://pukuwatisapejo.rf.gd/ncees_fe_reference_handbook_9.5_download.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/gokojewagimetab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b2ee69-061d-40cd-ab2a-dab88be38268/unravel_2_game_time.pdfIn PDF document text
    • http://lotapit.epizy.com/guvapukoteriloxavaxowef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e028d1b-6a64-47ae-a23e-0bf04b514977/best_way_to_write_dialectical_journal.pdfIn PDF document text
    • http://pevivudawof.epizy.com/7354885833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8149d244-69a6-4c30-bec5-03c0faa8e03a/sony_mdr-zx770bn_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8e6847-74ef-4374-b24b-93b0c836c53b/public_administration_associates_degree_salary.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/what_does_the_bible_say_about_knowing_gods_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd9d084-20a9-46f7-8fa4-8c7389926bdd/roadmaster_granite_peak_bike_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed55e1f-70e7-421c-a2df-4386a886ec07/optiplex_755_compatible_graphics_card.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 5436 bytes
SHA-256: dfa7ad2838882b8820e178228428ccb340dec48f4fd55dc06fd51890b314563c
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 6712 bytes
SHA-256: 533c12a6bad206fd996971308a417817c5374bc963da1b5caf33d7d81ca25347
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10016 bytes
SHA-256: 965aa1806c4aed4a009bc0ad2c5f795f3c16303257b2d38f7f022d9fdf0c089a

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