Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b17274a8a18d289…

MALICIOUS

PDF

68.8 KB Created: 2020-12-23 23:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0e740fef2287642f86d16005a517aa6 SHA-1: 7fcc9c1fc76bd5dc0c649d20f83a0b625961121f SHA-256: 7b17274a8a18d289d6fb08e69502a18780fc564f63a604273f917cdcb30bddf2
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one identified as a potential link farm, suggesting an attempt to direct users to malicious websites. The document body, though heavily obfuscated, contains text related to 'response rate' and 'account will be terminated', which are common lures in phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=ucsd+cape+response+rate
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/769393.pdf
    • https://cdn.sqhk.co/suwezuzifu/zYhciie/jomenus.pdf
    • https://cdn-cms.f-static.net/uploads/4416514/normal_5fbb324a4f28e.pdf
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5fcb1c0108d4c.pdf
    • https://cdn.sqhk.co/rapavuse/gcJgjhi/rofubiwofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c39614fd-7a72-4a15-98fd-16ffab14e818/lemuzapetuzemin.pdf
    • https://uploads.strikinglycdn.com/files/2064d5b0-ae39-4fd6-9734-e7201099fedf/adobe_photoshop_cc_2020_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/c36040ab-968a-4d8a-9919-74193218e630/93309308500.pdf
    • https://uploads.strikinglycdn.com/files/cd5988ba-fbc5-4c16-bb7a-ac838f048ec7/great_plains_lending_lawsuit.pdf
    • https://uploads.strikinglycdn.com/files/0c1ec873-f16f-4393-91ef-480b8a043a97/49155823807.pdf
    • https://uploads.strikinglycdn.com/files/6fb4d799-c20a-48e5-b7e0-e1b0a51ebaa4/jiseguxo.pdf
    • https://uploads.strikinglycdn.com/files/d064154d-1e90-4f3c-a17a-91578c20a852/ladejubumaboxifi.pdf
    • https://uploads.strikinglycdn.com/files/7fee5b85-465c-4a6d-bf5e-ad81975a244d/region_lock_away_free_download.pdf
    • https://uploads.strikinglycdn.com/files/48694c99-0e84-472d-b947-61bd108c8d9d/fuzosunupos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec0.bin
cfc9c190d7f62746535e0812274a4ad5419bea4be10ba21381cac95f3799e90d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 5028 bytes
font_01_sfnt_off0000dfea.bin
ef443fcf72527b791c42cb6dd5bf18b5732f651bc7fde12ca91f9f0e9c174b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 11256 bytes

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