Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b9d9dee6120cca…

MALICIOUS

PDF

73.6 KB Created: 2021-03-13 15:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: e572c7c410f00576d1367bd468fe623d SHA-1: 2abe7fa6952f8b602aa1309891af08a22f1cc236 SHA-256: 43b9d9dee6120cca7a719f634226e8ee69f415abc7a718a16a640089c6ba4554
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malicious PDF. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme to malicious sites. The document body, though heavily obfuscated, contains keywords related to medical topics, likely used as a lure. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://kuzutuzo.ru/award?keyword=asfiksia+pada+bayi+baru+lahir+pdf PDF link annotation
    • http://organicnu.info/33044428689dgwjq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496380/normal_5fe25dddb92b5.pdfIn PDF document text
    • http://duzegipim.22web.org/nu7100_55_review.pdfIn PDF document text
    • http://cartest.pro/663959057452ppyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_601b6f2068765.pdfIn PDF document text
    • http://bujufamamaw.22web.org/dhoom_bike_race_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_5fd0f36f01ca2.pdfIn PDF document text
    • http://pannochki-art.com/ftb_infinity_lite_mod_listsrisk.pdfIn PDF document text
    • http://xeeewq.xyz/anova_sous_vide_instruction_manual236r4.pdfIn PDF document text
    • http://monstergym.ru/vutivepejazoxodubob2ofez.pdfIn PDF document text
    • http://stankoff.org/lenovo_thinkpad_t430_usb_3.0_driver_windows_10xwmv0.pdfIn PDF document text
    • http://usblighter24.site/king_s_raid_gau_guidebpcax.pdfIn PDF document text
    • http://dream-stat.ru/230224256582p2i2.pdfIn PDF document text
    • http://myyshooop224.site/download_the_outsiders_booktsehm.pdfIn PDF document text
    • http://chambreapp.xyz/driver_hp_psc_1315_all-in-one_windows_7_32_bitcg6uq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_59dc02addc644908a7db72891de306da.pdf?index=trueIn PDF document text
    • http://belunovozexuse.rf.gd/interview_online_questions_and_answers.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_42f75c75f53747399fc537b926d35261.pdf?index=trueIn PDF document text
    • http://puvusevakap.epizy.com/muwanig.pdfIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_b1ee3cf50970402c9c4b22bdbb6db536.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_6f8a7564ab884d138587a0c4de6f7cf1.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_ea5eab9884bf426990bd91e5e4766029.pdf?index=trueIn PDF document text
    • http://gagonunanu.epizy.com/wewubimepadane.pdfIn PDF document text
    • http://wokoguzesel.rf.gd/annoying_alarm_app_android.pdfIn PDF document text
    • http://zepukedosapiw.rf.gd/behaviour_management_strategies.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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 5424 bytes
SHA-256: 082c783765c2061df16bd5db57f097511ec5f62b5b85b260eb153efe81a69633
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 9988 bytes
SHA-256: c295265e6607c1790fb2733b6b98f4a7a1b727ddfdc26d913be247727febcec6

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