Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1d0bfb4d91fd4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-23 08:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43c6b2d1b8bbd8f3b808b43bc75180c3 SHA-1: 1d9f3c1310f20456e4096458b97d2cdfdb7ebd7d SHA-256: b7b1d0bfb4d91fd4d98e1114736ae3c5543e5bcff664c36813e45d11a17152e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely phishing or malware distribution campaign. The PDF structure itself is also noted as a link farm, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=phool+aur+angaar+film PDF link annotation
    • http://mnwebdesign.dk/userfiles/file/kajikefufapor.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/favovojewuwo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/nobubanetikapugelokaf.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/25642298874.pdfIn PDF document text
    • https://medpressa.ru/files/file/marowafu.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/duzup.pdfIn PDF document text
    • http://www.bash.cl/media/file/rikiwexemevalajidopafozax.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bufaresiw.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/31476631094.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/68268983486.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kemubatadojukozazobozunex.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/16681613393.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/28789615939.pdfIn PDF document text
    • https://goodline.by/userfiles/file/finupibuwunurirun.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/gujizetuk.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/zirutekosedapunagufedew.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/45628600126.pdfIn PDF document text
    • https://cathita.vn/upload/files/40360608800.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219410483323.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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 10364 bytes
SHA-256: 613cf073355dc9df122325659d73acefb749e9a2d1144902cb8a22baebb06329
font_01_sfnt_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 19016 bytes
SHA-256: 4675bc237b6c934c1ce80ba9422f5bfe35ed7d71ea3d1cfd09dcbe636ece1a40

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