Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c28b1677378861…

MALICIOUS

PDF

71.7 KB Created: 2021-02-21 17:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c885722215cceb986d07c8a787ad6a98 SHA-1: ef5ac8d0f7c3e07db61eb0f2dd10777e529881ec SHA-256: 03c28b1677378861f52f7c4243f3458e4c69c31caf2ffd9798cee7997beb5463
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains numerous external links, including a link farm, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a likely intent to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=cell+and+molecular+biology+tulane+checklist PDF link annotation
    • http://ludshop.xyz/speedy_cash_wichita_ks_pawneewssnw.pdfIn PDF document text
    • http://lunesygets.xyz/70516645592ajwdr.pdfIn PDF document text
    • http://lotsmen.com/gazinuzifajabarusafux16dz7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_5fe1522fc71ed.pdfIn PDF document text
    • https://nolilozeto.weebly.com/uploads/1/3/5/9/135957670/b1f2d.pdfIn PDF document text
    • https://xaleratugigajij.weebly.com/uploads/1/3/4/6/134631249/83b949e.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/dafosetozekimipimajoxo8cm6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_6014758446a2b.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/kitakilesa/bamoninaxapadibuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/rojazutenarisasawofuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/10370333274.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/archicad_lamps_library.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/new_bollywood_movies_website_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/project_business_case_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/free_dictionary_application_for_android_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/ganesha_atharvashirsha_tamil.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_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5564 bytes
SHA-256: db88b556eb270985a0fac46cf9975f9320bf8ab48302ad2000c2c1c86656115d
font_01_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10260 bytes
SHA-256: e3511672e6758b724324c76c29db232f25fa7015f8157eadf6bad5906c47b3bb

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