Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c769c4dad417e81…

MALICIOUS

PDF

97.4 KB Created: 2021-03-23 17:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5923c06839cf50526b7650b85127eed2 SHA-1: d0b60660315e1f1297173570705522f479eaa1fc SHA-256: 6c769c4dad417e8120ab369caf93fea112714ecce84a2b1e14bf4e83b3ad3770
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of malicious links is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://dafemum.ru/wix?keyword=emglo+air+compressor+manual In PDF document text
    • https://cdn.sqhk.co/wozobifanu/hc7k3ge/throne_of_eldraine_showcase_card_list.pdfIn PDF document text
    • http://zirekafeti.iblogger.org/postknight_stats_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/jUhhEhg/15954213465.pdfIn PDF document text
    • http://saridiz.22web.org/80682439763.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/lgigiii/nursery_rhymes_for_toddlers_in_english.pdfIn PDF document text
    • http://djami.ru/adnan_sami_song_bestwap10poo.pdfIn PDF document text
    • http://bet-info.ru/konica_minolta_c224e_default_admin_passwordq4sue.pdfIn PDF document text
    • http://kind-insta.site/zafovirovopoxab1teql.pdfIn PDF document text
    • https://cdn.sqhk.co/sezivalaw/SjiRCxX/professional_photographer_near_me_cheap.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/954de8e3-e333-4683-b5a9-43142c62fc29/stunt_scooter_repairs_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd8ed8a-7620-4529-938f-2ad283c2ef81/self-love_meditation_louise_hay_script.pdfIn PDF document text
    • http://womopemi.epizy.com/webitagerupasuboluzorakav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d20557-a24f-4df1-b50f-cde2b90408f1/how_much_aid_does_the_us_give_to_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9872f1c1-13b1-4dd1-97d3-5b0b7c5e59ca/world_events_1900_to_1920.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/nukiwidobajedapexedatilos.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/poxuzememedifevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c58722-390d-4a8e-b61c-2659bf9ef35e/c_2008_programming_black_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a343db-9aca-41d3-8cfc-10716f50be59/wilor.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/56114772148.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/lubulililezetobuwobure.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_off00013979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13979 5212 bytes
SHA-256: adb414c49c88f987c9e1c593b98116d17727800da121aee7c0e648dc61ef1f97
font_01_sfnt_off00014b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1F 15000 bytes
SHA-256: 06a07a7dd13b2e97e3a29a90f5e996b60f728bf5f3bf1f45e9874b80d58b5a99

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