Malicious PDF — malware analysis report

Static analysis result for SHA-256 509d21cc6594f665…

MALICIOUS

PDF

65.3 KB Created: 2021-02-14 22:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88ccaf89fa0d7bc61095087806391775 SHA-1: cc2b3cb22f15ef951adf4c8a953b97e46d12858c SHA-256: 509d21cc6594f6654dcc89c2c7ddb927e88d7a96bcc3393588501d37d089f680
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of urgency lures further supports this, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/123?utm_term=36+hour+day+latest+edition PDF link annotation
    • http://mon-fortuneo.best/manual_limba_romana_clasa_7_onlinejjpq0.pdfIn PDF document text
    • http://eurostore.info/armourers_workshop_guide4l91i.pdfIn PDF document text
    • http://fakts.design/bike_jumps_to_buymhodu.pdfIn PDF document text
    • http://lenudes.com/betternet_vpn_apk_old_versioncyxt9.pdfIn PDF document text
    • http://newyearshop.site/black_leather_platform_ankle_bootsi0dru.pdfIn PDF document text
    • http://inostrana.com/pofeben0nmyq.pdfIn PDF document text
    • http://medyahanem.com/xavexilubekepowpsaue.pdfIn PDF document text
    • http://fovuvizoge.22web.org/54095763582.pdfIn PDF document text
    • http://speak4pro.com/tupugajedugalafuvovafim9r4p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugafezozanuw.epizy.com/virimubepakamo.pdfIn PDF document text
    • http://kekunulu.epizy.com/aol_10._0_windows_7.pdfIn PDF document text
    • http://nemevefer.rf.gd/edm_acapella_free.pdfIn PDF document text
    • http://midugome.rf.gd/retidubusetolupenenegora.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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 5240 bytes
SHA-256: 9c64e963b82a52148326c762ff09800eb7cdc88d1d7171aa3542a48e4f7c7122
font_01_sfnt_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 10760 bytes
SHA-256: 5fa33619ce37e9ee3fa900d25d134026feaf547a47f21ab7a335918f74af7241

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