Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de5bbf4a4a913c5…

MALICIOUS

PDF

84.9 KB Created: 2021-03-14 07:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 085a7299488d7fbd3d2b4b5d269e8011 SHA-1: 2fc16e3902cc91b49669b66c9209c1affed411b8 SHA-256: 9de5bbf4a4a913c58eb4b3f87abfd8792b95b3b73c2ff2ac1505019bc20e6935
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, forming a link farm hosted on disposable domains, which is a common tactic for distributing malware or directing users to phishing sites. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=seok+chang+ryu
    • https://fovevirikat.weebly.com/uploads/1/3/0/7/130775443/2135620.pdf
    • http://jisutuxoxaza.medianewsonline.com/reborn_demon_king_anime.pdf
    • https://cdn-cms.f-static.net/uploads/4453718/normal_6049b2bc7af3f.pdf
    • https://cdn.sqhk.co/gixelotopa/EoPhijC/71524490470.pdf
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/a702c3e296e.pdf
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/97c0efb.pdf
    • https://cdn-cms.f-static.net/uploads/4379731/normal_6025273d55954.pdf
    • http://ganitigusawev.mygamesonline.org/gutololev.pdf
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/suvumoxesodafuw-pasusakobe-kanuniwiwu.pdf
    • https://cdn.sqhk.co/forexidof/ghihmmE/homescapes_level_24_hack.pdf
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6024cca16e4f7.pdf
    • https://cdn.sqhk.co/zirigajer/jgYW4mN/zidudepanizijin.pdf
    • https://cdn.sqhk.co/jugomuzuteb/gfd9ggX/how_to_use_activity_launcher_app.pdf
    • https://cdn.sqhk.co/bizujutenifo/aLhhecb/gefal.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/bewewogafofavutab.pdf
    • http://xolokeminapi.getenjoyment.net/16421933653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jirabasojexosud.atwebpages.com/gafizidaf.pdf
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_bcb7665300864166b9c0d66503c9799d.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_912d75e27d7b4a55b44e7f2fde399c96.pdf?index=true
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_fcda321fd7ee48e5914a1cd2f081253a.pdf?index=true
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_317b1bba86894379aeb00b9ce599e3d8.pdf?index=true
    • https://s3.amazonaws.com/roxawo/2_cycle_engine_oil_msds_sheet.pdf
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_d894c4ddff004c4ab5c653abf6977651.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/how_to_train_your_dragon_4_release_date_malaysia.pdf
    • https://s3.amazonaws.com/bulozor/90009335492.pdf
    • https://s3.amazonaws.com/jolunenafobuw/artificial_neural_networks_and_their_applications.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f34.bin
baa9c65a0b51359b8982d067f70aba08d0ca47dd9c8ceb47a430f708a33c10ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 5120 bytes
font_01_sfnt_off000120ac.bin
e988089cfde13874c2a48f56376aa5a22a2f7e1b038d491047dc8535c4b80127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 11904 bytes

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