Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5af4a4300a81633…

MALICIOUS

PDF

82.3 KB Created: 2021-05-12 16:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6550b62ee46d98c2adb435b9967feb3e SHA-1: c569b798fa0ffc384682a869c271269bcb62c10e SHA-256: d5af4a4300a816338d800d81d8b126fae0d13a91ecbf7840eb26093bfdd9774c
186 Risk Score

Malware Insights

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

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 0.9990

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=best+girl+names+2020+indian PDF link annotation
    • http://gutibefatidag.medianewsonline.com/bekovep.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/hggihhj/ganolexetafuvupitapid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459163/normal_606ea72590a59.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/DhjOAsP/dunaponutojosizagufezax.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/jnakhdi/ultra_hd_4k_wallpaper_zip_file_download.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/limegetakukagivoxunapuna.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/796212.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/1000_and_1_nights_summary.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/aadhaar_form_download_in.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/gcBnmCg/classifying_things_worksheet_for_kindergarten.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/causas_de_alopecia_areata.pdfIn PDF document text
    • https://nabodumikipili.weebly.com/uploads/1/3/2/7/132712011/9284385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_603490dca1634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6064bd69be855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_60463a9f4a743.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/kalitex_manomave.pdfIn PDF document text
    • https://pewepexit.weebly.com/uploads/1/3/4/6/134659954/9760604.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/bakifi_peduxetobog_jefazamisev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc98592b843c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_605c5103e9a22.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/d8fgcjg/escape_logan_estate_chapter_4_act_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_602d5e7734c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_601cfc1519415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://futebowa.atwebpages.com/42063456123.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 5148 bytes
SHA-256: 6006121f4dda571c8b20bdcf9728a29b07cddb56672155341a629c3b58b43bd6
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10972 bytes
SHA-256: 000b6cd64975c81236f56374cb0a59401c911a2fdebed804e28374ebe4670724
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176