Malicious PDF — malware analysis report

Static analysis result for SHA-256 55735fd370e2d0a4…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 22:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5f1aff59c24f11ac1b0a227de7bc4fa SHA-1: c81fba4fe08211e9fcab46b61aaf93495001d8a7 SHA-256: 55735fd370e2d0a4c5b04a61aa918bfd99cfd96e95cef6cc395aa55641f8a8e3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One embedded URL, 'https://dugedepap.ru/wix?keyword=apk+fifa+16+ultimate+team', is particularly suspicious and likely leads to a malicious payload or phishing site. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://dugedepap.ru/wix?keyword=apk+fifa+16+ultimate+team PDF link annotation
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/1719761.pdfIn PDF document text
    • http://rakakap.iblogger.org/genestealer_cult_codex_8th.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/6875ea6dc548a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_601325e929d90.pdfIn PDF document text
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/2309233.pdfIn PDF document text
    • https://buwolipirawelas.weebly.com/uploads/1/3/0/8/130874522/2037942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5ffcd6a7266d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422659/normal_600834097ddad.pdfIn PDF document text
    • https://vetajovowevisak.weebly.com/uploads/1/3/4/7/134715596/kurelopeju.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/sikuva/free_chrome_browser_for_windows_10.pdfIn PDF document text
    • http://tuwofexuguxu.epizy.com/15043612321.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/course_hero_bloomberg_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd6dcb4-f194-4fe4-83ac-493c488806dc/how_to_work_a_speed_queen_commercial_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4682f995-1229-40c3-a898-888c81943d1b/best_funny_motivational_quotes_of_all_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1316d4d1-cf7e-4d88-afab-03da9c410728/7466839239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ff7554-9229-4fe3-8c13-225dda12d75f/1001_nights_restaurant_shanghai_menu.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/simple_html_page_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e3889e-2024-47cf-9b35-556f41e7f022/pikukiduwudotari.pdfIn PDF document text
    • http://dapunujunet.epizy.com/50_ways_to_leave_your_lover_drums_steve_gadd.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/33554218071.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/39883777041.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5032 bytes
SHA-256: da9ae50d388758024ccfc0009d744364d7f2933a274556a1799e52eb5c3de7f8
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 11064 bytes
SHA-256: 96381ec41a3f393eb295b464f23fba7b440a03d914862cf385065a0f55704d96