Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b04db91034556a6…

MALICIOUS

PDF

72.6 KB Created: 2021-02-16 06:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b75543a54e2a1d075f3b250f09941c5b SHA-1: 32f2fb62365e48d27ed836a2ec40bfbbf6dcdb32 SHA-256: 5b04db91034556a6876dc52010216e79a7eb62fa77d7ade7326ead33b09da023
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URLs suggest an attempt to redirect the user to potentially malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the heuristic findings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=11%252F22%252F63+book+age+rating PDF link annotation
    • https://cdn.sqhk.co/nifijagik/jeNhja9/vr_home_theatre.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/3a74ee0dc.pdfIn PDF document text
    • http://airbin.top/13511176750pyoxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377098/normal_5feed6270be1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fe81b4251f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_60055e22ecd57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_60040985e3075.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/hhhhbPj/legacy_of_discord_furious_wings_hack_cheat_diamond.pdfIn PDF document text
    • http://bridgecommerce.com/tidijd0znh.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/cdr_to_jpg_converter_free_software.pdfIn PDF document text
    • http://4kuhd.me/download_viper_android_pieccooh.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/Y9Qhj7B/rutexuxinuvojil.pdfIn PDF document text
    • https://gipebikurowa.weebly.com/uploads/1/3/4/0/134095939/8718ec991c0390a.pdfIn PDF document text
    • http://fbdirect.site/online_rpg_multiplayer_games_nosvex2.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/zorabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408706/normal_5fcc9238da4ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408704/normal_5ff968701f50a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubaforan.epizy.com/baahubali_1_tamil_4k_movie.pdfIn PDF document text
    • http://batogegimuwew.rf.gd/bepujaj.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/kipivapinolof.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5288 bytes
SHA-256: 81e82c2d6cd1233fd42b93f49b0a9a4bec63da2f0705b0983076f820eda747ba
font_01_sfnt_off0000f766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF766 10428 bytes
SHA-256: fef845c26ab3102579438ab1162c406b7aab7ad9854225b9b0c99bdb881c5a43

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