Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedc82dc703edeff…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 07:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a4f763134ad8e4f10400ee5e71b57355 SHA-1: e54e28ccee58f5d33ae3585a3d55a846e59d051f SHA-256: bedc82dc703edeffd2e658fc8961f2c0e8234cd575071a73252bf2d57e4df3c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be link farms or disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded content suggest it's intended to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=why+eat+honeycomb PDF link annotation
    • http://puginternational.com/ckfinder/userfiles/files/palatebuwe.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vafirabigapigi.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021092223075392.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/lasivumeb.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/41186052279.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/zixawuxunuv.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/36828568672.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/lebisenoreribomiw.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/rixival.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gewuku.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/divawopine.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/70236001547.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/9104340509.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd04f2b8dd---83730303469.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/76737937742.pdfIn PDF document text
    • https://suny.cz/files/file/varawevi.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/pipinoninumomalef.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/kivakuwo.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/75962862544.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/zemiserowukaruladugasowam.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/45415880334.pdfIn PDF document text
    • http://foxhill101.com/userimages/ramuxipafesemezikivisiri.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/luderoze.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/bidurobusema.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/55540100813.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41F 10336 bytes
SHA-256: 878c39d143d6e314eb16eec0c2b5a98ff3090b545e84c1a51b7a5fe2a1b9e8f5
font_01_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 16272 bytes
SHA-256: c09a17f814fff031f1e08b73abc930d134bad93b72ac463cdb2c4e5f0ffadbd2
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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