Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fe103f3003922c…

MALICIOUS

PDF

76.6 KB Created: 2021-02-01 09:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: de5273d5a3e8b0e8473fac915b0cf846 SHA-1: d06ed4cfa83c94133d8388ef142ef38779d854a9 SHA-256: 44fe103f3003922cd5e64770a3ea10423fadf46245c89f9a8d380b14aeb4fd80
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple external URIs, with one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to malicious sites, likely for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/aws?utm_term=mpsc+combine+answer+key+13+may+2018 PDF link annotation
    • http://letxxnx.org/81563294321tp8ch.pdfIn PDF document text
    • http://sis-paypal.com/tunilibugomezigagopexotebzil6n.pdfIn PDF document text
    • https://cdn.sqhk.co/dimawenibad/hhCiahf/how_to_get_100k_followers_on_instagram_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5fd9af98f15ef.pdfIn PDF document text
    • https://cdn.sqhk.co/mifodirula/wxiboig/zomuferofeseb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fcf5c7d91ad6.pdfIn PDF document text
    • http://proflist-kursk.ru/codex_craftworlds_8th_edition_download0hzq2.pdfIn PDF document text
    • http://cmbespaceclient.xyz/download_nba_2k17_for_free_ios62yop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://roragopijejem.epizy.com/bertinet_dough.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/26095749851.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/bittorrent_vpn_apk.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/doboxagunoteriw.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/digestive_system_multiple_choice_test_with_answers.pdfIn PDF document text
    • http://didopip.epizy.com/51430357046.pdfIn PDF document text
    • http://devoleresi.rf.gd/tojeputudogosov.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 6132 bytes
SHA-256: 7a5311522e7bd90eee72a516f9a3a88fa8740ae988cf900119644f3988e133f6
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 10456 bytes
SHA-256: 8fa08c2b571d3108db22bbdcf54c29b73cfe7aca4597de4fa16aeabedf4e4557
font_02_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 7220 bytes
SHA-256: 02ff3d138d826141672a4b8a2a2f9b9e75491f1f7da218c230949a45df469607

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