Malicious PDF — malware analysis report

Static analysis result for SHA-256 104e8ad2b888e96b…

MALICIOUS

PDF

75.8 KB Created: 2021-06-13 09:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8a8c17c0a0e38d0fe011996696bbaf3e SHA-1: 6ea7e5192894e9dfaf1e3a7d9373ab0a9c7324e0 SHA-256: 104e8ad2b888e96b86bb1740edb065b7f4d097eaf222909f0bb1e955b282ecfc
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 0.9991

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://coretry.ru/pbw?utm_term=vetri+venduma+mp3+song+download PDF link annotation
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/meroxuwabofenu_tawesowetal_xofefijagileja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fe70e0ee859d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_604921b034300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_601e81060d5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_605d9416de038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fd64ec0e6453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fe64c3c5615c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_5fd7e039d8d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_60c31855d0884.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410983/normal_60b1fe298f8a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_6058e276261d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_603ec4d1a220a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_6026cbc163f4f.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/xosirowaw_tuzurobumasubub.pdfIn PDF document text
    • https://rixesibajarij.weebly.com/uploads/1/3/4/7/134712387/lefatozifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_600af9a79e3a5.pdfIn PDF document text
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/pixaxizezapego.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/wiluvukonofofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64379c07-4280-4787-9612-b467bf583eae/fallout_4_new_vegas_release_date_ps4.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/zugimoz.pdfIn PDF document text
    • http://lofupevaki.pbworks.com/w/file/fetch/145225335/i_gotta_feeling_mp3_song_free_download.pdfIn PDF document text
    • http://molosafokaji.pbworks.com/f/wow_classic_hunter_pet_attack_macro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8083e00d-57fd-43cc-9e0d-2b95bdf59876/poxuzine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a364ae-91f9-4902-9076-91da3559cf8a/do_houseflies_have_antennae.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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5560 bytes
SHA-256: 1e9c06172b204ec5c518b9b04e3bfb823dbceec18cd4c7039abc538c03872455
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10972 bytes
SHA-256: f1bf4264058ecf944d252142ce8a863a2359adeb9f343400d83ab2a1d634a8a6