Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd8a5feb7874750…

MALICIOUS

PDF

87.0 KB Created: 2021-04-04 16:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2d478959559c7718608a4f15ec87bde9 SHA-1: ebcb4bb2f29fbbaa835fe43a30d0bd5f905642a3 SHA-256: dcd8a5feb7874750b128b854f6577465e8d013dccbbb89cbba5008483cbfb5e9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://fokemale.ru/strik?utm_term=is+apollo+twin+worth+it PDF link annotation
    • http://pufivuziviv.mypressonline.com/bilekugilaze.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/characteristics_of_literary_language.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/16513083154.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/36167836423.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/agile_methodology_testing.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/85596756544.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/zuzewitokovusame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_4f86cb7222034dc0a004a71bcfce7391.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b69dbf-883b-4bff-8fa1-7719a80a6228/digital_communications_specialist_pay_scale.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_cfafb36050bf4bbeb4fdc156f6a10b2e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac178a25-52f5-403f-bbfb-810bb9a96af1/81838186325.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/napier_press_sociology_book_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944d7730-e610-476f-ba19-cbd68f3bc24a/13246795994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff19b1dd-de97-48e4-9a12-b50724ee1bd1/34137791286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4d076e-84fb-4428-bba9-9be023c0ce79/jematukisojo.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_a9b58e6a5430404abb053c9a06621f19.pdf?index=trueIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_1073e059f3744b36a6585ac23f0f4d69.pdf?index=trueIn PDF document text
    • http://rabelinowizufe.myartsonline.com/free_willy_soundtrack_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b24e7d2-3add-4ba5-b6aa-263c8f9e66c4/xaraneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3dd76b1-9498-448b-afdf-24131965a549/44225007660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 4608 bytes
SHA-256: 074232ab57833cda41d01b6c31dd44c9d8a92e1f2d31073e37f416a88b9c430c
font_01_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 10552 bytes
SHA-256: 4912fd6c4c04d964c9c32b279d0f7e713874f344804462a6c9cf5b73d811935d
font_02_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230