Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed427415af4deeb7…

MALICIOUS

PDF

92.3 KB Created: 2021-01-23 02:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5824db80ad62a97d5b565f2f8049373b SHA-1: 942a912a9c5af363f847bfb179b706a39cc27e3d SHA-256: ed427415af4deeb7754a3d9324080e8d6793d260093b2b2c508635dad621a384
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=alton+brown+wife+elizabeth+ingram PDF link annotation
    • http://borutafag.66ghz.com/alice_mail_android_app.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/bhagavathi_tamil_full_movie_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5ff8d69bc039e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ffcd8d98e7ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fe8b30e059da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428062/normal_5fe17f34f28a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fc9aa3e1119d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_5fd8f4ba212dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_600b6667882b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463306/normal_5fe383d405d3f.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/8d33d4ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tugojolowok.epizy.com/bailando_english_version_video_song.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/ob_gyn_history_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 5064 bytes
SHA-256: b14885e6b43ced6c2520297468d31e59733af26f9b975705988a94cabbf125c8
font_01_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 1552 bytes
SHA-256: f55c20ba40ef196161d27a068cae9bcd7a0ad2b10dc89563db987942eae6e344
font_02_sfnt_off00012cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD2 11956 bytes
SHA-256: c435dcc79ef448c97561f7292a8e0325ae40f8da5334a2ae56e5c089b3ca5392
font_03_sfnt_off00015530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15530 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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