Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7920875d4385f88…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 12:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad1bd1c14b4a6b49a6202e8f8941f406 SHA-1: d4cc83b08abe054af722579e5391ddef3a343bce SHA-256: e7920875d4385f88c248e5da87d6d7854c75e918fec9fa8e96d06b23217ff26f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by an ML classifier. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO abuse tactic. The presence of external URIs and the structure of the document indicate an attempt to redirect users to potentially malicious content or for malicious SEO purposes. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16149556156f77---74663656337.pdf In PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/66957401606.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tewitowominapomisak.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/bemitifez.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069c94e220---77257415202.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/52160515344.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/resimenumevanipo.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914104809.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/31413302413.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/45137915646.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/kubisijozelowewo.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/xerizuzivodesupiv.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/16683583432.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/lujajaxemu.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/lumojowajukazutofigag.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/gotukaserirabisovewuleri.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/81931857345.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/fulawumi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/84308033228.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/35383891760.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/20618150900.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/rogosenigugur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+matrix+reloaded+stream+freePDF 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_off0000adb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB6 10580 bytes
SHA-256: ede5c481d24df42c29034400864304f2d126c98a9547c693110ba57b81906746
font_01_sfnt_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 14828 bytes
SHA-256: b5738ff77d46881c8544a1469ca1f348dc908f3b5e963c83807c2181d4677f3a