Malicious PDF — malware analysis report

Static analysis result for SHA-256 efede0b602c606e5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-03 07:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a5c6789a0cdc75fa9004bd6c6bc1268d SHA-1: 40ec16cf5f5c598dd3d0ed4f865c93fa42066410 SHA-256: efede0b602c606e56c8d5b858645509f8214feed123c9e39bd08c3f12bd8a56b
204 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The 'SE_ENABLE_LURE' heuristic suggests the document itself prompts the user to enable content, a common tactic for malicious documents. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://dafemum.ru/123?utm_term=customer+service+jobs+description+resume+sample In PDF document text
    • http://tanemazijafawin.medianewsonline.com/what_is_a_antonym_for_captivity.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/qKjhNjf/cop_car_sirens_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/hdgWhil/red_rose_jems_pizzeria_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ZI4b3he/big_game_hunter_2012_alaska_day_2.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/hgPI1DK/77245948488.pdfIn PDF document text
    • http://fibilif.iblogger.org/maryland_coronavirus_numbers_daily.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/ie7Iuhj/wetapunegeposawakavedusot.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/tiajijg/smash_the_glass_game.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/how_to_turn_off_casio_beep.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/maze_runner_4_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/hbijiaX/sort_stacked_bar_chart_by_value_excel.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/download_google_maps_app_to_my_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowesiredud.epizy.com/63070662742.pdfIn PDF document text
    • http://fomabobas.epizy.com/euro_truck_simulator_2_keygen.zip.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/mimewu.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_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5400 bytes
SHA-256: e6549079d291b389b9920e92bcad99ad787a41bf39862d3c7e66006f3b1f49f6
font_01_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 10168 bytes
SHA-256: 529c777ee6f666582e965438cbfed5f292d05a117d0ecccdacd5e078f15a3a3d

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