Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acb4e8779555e20…

MALICIOUS

PDF

81.2 KB Created: 2021-03-02 23:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3e8209af0d8ad22e8ba347ff9cbe2ba0 SHA-1: 9465b9efc5ec5e28b0a4f07e01f0e9b15e1f2edb SHA-256: 8acb4e8779555e20402b4178497a716008ae78a6124f9be0932072d10b2e76fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=my+samsung+tv+will+not+connect+to+internet PDF link annotation
    • http://registrat.space/70531311250ws53g.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/9165528.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/8689485.pdfIn PDF document text
    • http://autolombardpro.ru/diablo_2_lod_patch_1.13_d_downloadfxwdn.pdfIn PDF document text
    • https://lujuvikib.weebly.com/uploads/1/3/1/4/131406806/f2990c.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/lobisaxedilusoxanav.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/bible_commentary_app_for_pc.pdfIn PDF document text
    • http://fallofelin.online/46426811285tz5zc.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/what_is_the_wps_button_on_my_canon_printer.pdfIn PDF document text
    • http://sneakerspapa.store/40752971168e8w2o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450417/normal_5ff1e735867d6.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/roxoxusosefevut.pdfIn PDF document text
    • http://fbcopyright-center.com/akhiyan_da_surma_chan_ve_ringtonez132d.pdfIn PDF document text
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/6612115.pdfIn PDF document text
    • http://vadukut.iblogger.org/13212076511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifonefoje.epizy.com/chronicles_of_narnia_silver_chair_movie.pdfIn PDF document text
    • http://tapaxototolu.epizy.com/android_studio_book_2020.pdfIn PDF document text
    • http://tizidirek.rf.gd/wintoflash_windows_7_bootable_usb_free.pdfIn PDF document text
    • http://silapopo.epizy.com/tiwenijudojupogo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 5380 bytes
SHA-256: d7d73155a88fc52c3efe5780e6c1c7901aae9f984d2e87a8b727bb4aee888f41
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 10032 bytes
SHA-256: 474088e5d75a2b10c941c14397668911f3680433e5e207f56c421de245865514