Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f63ac10f166b209…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 02:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37115e12da876b1f164191da4dfbb6a9 SHA-1: f12eb1e2d27ea31f20e1ee5049c9f8ee9d9c2dd4 SHA-256: 3f63ac10f166b209336d25ff5a733ccebb62e9416461c5be8a14297a882c3f39
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The document contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of 'spyic download apk' in one URL suggests a lure for potentially unwanted software or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eko-briketes.lv/userfiles/files/39119375033.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/76896197192.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2b243e5c---1071775372.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/rogetewaxedikakeruzegoja.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/xuzokixuzavenenugatedeloz.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/89177936906.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/xupuwelifa.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/80220253841.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/deguxifaluwexurane.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/53291243446.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/40636167244.pdfIn PDF document text
    • http://quinta.cl/upload/files/83232612501.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/zalikigekog.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/9718817076.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/kinujagutigekuxekobubulev.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fuxamojosagaragudanuwedu.pdfIn PDF document text
    • http://tdbm.vn/upload/files/firufovepapofepogafugope.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/suvafozirones.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/41324688068.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dasemomazetetit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spyic+download+apkPDF 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_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 10376 bytes
SHA-256: 9b809d487528a9ef841114592ea820e7f6a50922cd6457bd96ec70d1e24e42af
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 18656 bytes
SHA-256: 88670616cd40b2e3e4d3bafc82435eb286887f9ff3ee3880a0955cdf4977aed8
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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