Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecf5660b8d11d42…

MALICIOUS

PDF

83.2 KB Created: 2021-04-03 00:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ff8be9ca2063e5df39bb4195269327f SHA-1: e341e10321214cb47b4990b9b7c206d5535b30ca SHA-256: aecf5660b8d11d42057d958fa75f1be399874328d10d71f2006811953c0e7549
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://vilenefex.ru/strik?utm_term=how+much+does+a+tune+up+cost+at+meineke PDF link annotation
    • http://wikurabafewo.iblogger.org/70298537148.pdfIn PDF document text
    • http://xasejujarelux.iblogger.org/optiplex_7010_i7_max_ram.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/tabazegode.pdfIn PDF document text
    • https://bibonuben.weebly.com/uploads/1/3/4/5/134576194/1445174.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/mgior6e/wijewugutotufonivuwos.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/heY4ico/dokewaxajipiwubejej.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/jfjhHjg/modern_dining_room_sets_for_8.pdfIn PDF document text
    • http://korezafegedim.22web.org/26989251058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedigopafuwu.rf.gd/xiligulaliva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef9d326-a0c1-47b7-b9fd-d9692fc3c4fd/44388494237.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/buvibibevofojumemovitezew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff864c0-a21a-460e-8b13-219585dfcb13/faviminapojupoliwulenogur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e322de-f089-4b1c-8086-57eb54aa19ac/26266493048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59706c46-7053-478e-be1a-c4adbd74a0b8/cannot_open_printer_properties_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/apc_battery_back_ups_xs_1000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/15519863047.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/bootstrap_moving_box_carousel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/70425547324.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 5300 bytes
SHA-256: 441ef39e6fb5bafbf4e09842679de29a800c55a1af9723f68e87637bab89ef4c
font_01_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 10668 bytes
SHA-256: 72a69cee7e8e29dbd76001fcc9378d7b2186b22def026206f46c9f417045d31b

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