Malicious PDF — malware analysis report

Static analysis result for SHA-256 442e6c28cbf9e434…

MALICIOUS

PDF

76.6 KB Created: 2021-05-14 20:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5faa8bb68bbb56069c37f21e938b2aa0 SHA-1: 80113e8479ed5bd7958383e42ae23b864619828c SHA-256: 442e6c28cbf9e4345e695ecdbb03dd8549b65d0abf078fce6fb629db90af023b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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
  • 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.
  • 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://maypoin.ru/strik?utm_term=pantum+p2500w+toner+powder PDF link annotation
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/6646154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_5fe4b43dafda3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fd69fc1125e2.pdfIn PDF document text
    • https://votorivoxezi.weebly.com/uploads/1/3/4/0/134095847/741e004994bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_601aeedd237ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fc97860d1c0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezatavaveb.epizy.com/iot_based_agriculture_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7741a49b-af8f-4d33-b643-f19bc2067ec3/gawiruwor.pdfIn PDF document text
    • http://jawafirabapilex.epizy.com/german_conjunctions_list.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/app_store_for_toshiba_laptop.pdfIn PDF document text
    • http://bekuladisupe.rf.gd/how_to_fix_camera_on_lenovo_laptop_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/what_do_esc_beeps_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/masters_in_accounting_information_systems_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33b7b77-523f-4e90-8fb8-5a9f34148663/honeywell_thermostat_wifi_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/the_impossible_quiz_answers_16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023cff84-45c4-4a81-aa55-4a0ad01ee931/asus_p7p55d-e_lx_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/lg_top_loader_washing_machine_leaking_from_bottom.pdfIn PDF document text
    • http://tatefes.rf.gd/usa_states_crossword_answers.pdfIn PDF document text
    • http://fewakemuwu.epizy.com/pobepebuxibo.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/abdullah_movie_video_songs.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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 5384 bytes
SHA-256: ca52de1355b6fd949222b701f75adb1fdaa4622247f7717214067e3c1b71693b
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11004 bytes
SHA-256: aa7bd160449bfcb89d2cea59a9625557281d2159f3733385da8e2e82334c5fce

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