Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2799859efbdaef…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 06:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 188d5513b5e2c54f3d35ad4c640aa2c8 SHA-1: 2f48973cbdeaca5cc7e9de6bc43c542fb532cb2f SHA-256: ab2799859efbdaef8f4af5304b3fab500ab7e4e59b602c0d64168318f970e901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was 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 form a link farm, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a high number of distinct hosts with few links per host. No scripts were extracted, but the structure and heuristics strongly suggest the PDF's purpose is to lure users into clicking through to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://aire-limpio.com/img/editor/file/1160643262.pdf In PDF document text
    • http://infosierra.es/images/editor/levipodonewozopotip.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/7430500379.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/68930778724.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/ligobevavesapot.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/9769895834.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/vabirulinipituroxuni.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zonowazulekabawaduwe.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/tibaferu.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/73858589938.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/38659625665.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/14927069071.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/simirapowonun.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/larirexegeka.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/77559829421.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/83042005152.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/solemuwepedawejinomot.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/bususo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/sugokuxusuvor.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/zumuvuwitadizomifeli.pdfIn PDF document text
    • https://el-tall.pl/pics/file/94178825468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=11th+class+time+table+2021PDF 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_off0000acda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 10508 bytes
SHA-256: 0159f578508880e6bf4e480121227e7931159eaa607505d5d0240b8273693688
font_02_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16952 bytes
SHA-256: dddb8ce55d4fa53605e0d12f0fcca783ce37047d01e130a47e61763c70e2b4f9

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