Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e420071e6c4d98…

MALICIOUS

PDF

70.8 KB Created: 2021-10-04 09:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8d537fdf7cd4e96b8794c55d305fcff SHA-1: 7e32b99722c7cce425dacfe6e2d1ac50bf45a6c7 SHA-256: 66e420071e6c4d988abb0801098489f4aea940b6c9d566e9b9edfc34aa7391ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/vovopavebi.pdf In PDF document text
    • http://sbcnepal.com/images/file/39993705434.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/6061434330.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/24169961415.pdfIn PDF document text
    • https://aneri12.eu/res/file/pabodagufoxopivujavesud.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/72192452430.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/jigelogemolubonaze.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/47454507372.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/fiwepirexenabovijak.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/66266971629.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/63724985204.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/86319306745.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jojalalaxuvopepinopesaw.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/jutimenuma.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/doxidiraxizixikesax.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/21230432585.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/gejabumeninofedowu.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/4197800597.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/77485328008.pdfIn PDF document text
    • http://hanifeugur.com/image/files/83960752298.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/18959634838.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/kijinuzedejuja.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/28313540562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=why+do+dogs+eat+grass+when+their+stomach+hurtsPDF link annotation
    • 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_off0000b142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 11064 bytes
SHA-256: 25d18ed0f840c2b43722b20cae82c4db9123f2c292b58ebb4cfe658ea72359cb
font_01_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 16848 bytes
SHA-256: 8df4c6a74a51f28d15da4c83d80bdc8ce516c3743de86c1c32088a3155a2e91c

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