Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08003a16d81e900…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 15:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a3aea291fa3a3402f00b876172fa6c0 SHA-1: a4223f5d6d1e5ba79a460af18bac1095aa242fb3 SHA-256: b08003a16d81e90002ddb5b27be600f7cd737a06799112597e01805e78df05c1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-confidence heuristic flagging a link to an algorithmically-generated URL. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an intent to redirect users to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://candientushinko.com/images/file/69583624167.pdf In PDF document text
    • http://pensjonatagat.pl/userfiles/file/58872074726.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/buvapavofepiw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce73e46e5---foleka.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/tedediwakofezugi.pdfIn PDF document text
    • http://ihdbd.org/upload/files/29852462280.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/19708031451.pdfIn PDF document text
    • http://dongphat.net/upload/files/somipaj.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/wojawelojozibikavasu.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofuxonawipepovolu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090402123052.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/nitevigisejubusixi.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/darijuwaf.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/fogozamakigexaza.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109010943323056.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910135323695753.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kuvasexarijuxofudokat.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xelesanugoko.pdfIn PDF document text
    • https://aneri12.eu/res/file/64743572918.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/ninisiguladud.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/rimarixilabigagopepad.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/75497211746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+vip+mod+apk+unlimited+diamondsPDF 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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 10892 bytes
SHA-256: a82ee7ee95200300c15413750ca4be2f6ff4d8e996700147fa926720b17fe0c8
font_02_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 19408 bytes
SHA-256: 8bc35673013e6212deb4c5cbb99d3bb103153aa366d2535bb7aa2be95427fd45