Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84bf4c9d8b96f6f…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 22:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81a2d63181f788802324e43bfbc15757 SHA-1: eb4a888655500f25cdd9c3e6b4f6bdcd9f00cadf SHA-256: f84bf4c9d8b96f6f72f20158697b9a348591312a37276765f796740827de0ed0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=academia%20boa%20forma%20parnaiba%20pi PDF link annotation
    • http://verifybadgehelp.com/61559066364tfhaf.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/zisimedifexerel.pdfIn PDF document text
    • http://natikolom.site/jessica_nigri_lingeriepdvwk.pdfIn PDF document text
    • http://smartbright.club/35556649375w7dr7.pdfIn PDF document text
    • http://cooldomen.space/84704842951hiuoq.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/9983287.pdfIn PDF document text
    • http://wildber.store/papazanananalusobefesogos45nun.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/cd9442c17adf2b.pdfIn PDF document text
    • http://realwockyc.info/hedonismo_eticaaeewu.pdfIn PDF document text
    • https://xatotowo.weebly.com/uploads/1/3/2/7/132740458/1471005.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/diwufomobefiji.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
    • https://s3.amazonaws.com/lizuseguwix/15252272964.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/essendon_plane_crash_atsb_report.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/70914873143.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/rimajesidasu.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/avast_antivirus_for_windows_10_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/6399869126.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/cen_cenelec_guide_22.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/transformers_2_arcee_sisters_toys.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 4928 bytes
SHA-256: 25f6219aaae0afb2ba725156e6bc7e2b72ff1d9c3f7b9aa3b78478cc3ccefc5f
font_01_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 12288 bytes
SHA-256: feaf6efe4004642132314604645566b8f6d193348b561595191de02a60eed9ae
font_02_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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