Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bebb8e57e9ab04…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 16:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5858ffa92fcf3c60f212a1e5abcaec1 SHA-1: 8f6cbca8bc49959f4bf7757dc8199f9205101f48 SHA-256: 88bebb8e57e9ab04d417471bda0d7ad9264cc99f547eab2a90f80e2ea4cd2fd5
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://jottigo.ru/wix?keyword=lecturio+coupon+code+2019 PDF link annotation
    • https://cdn.sqhk.co/sadudolamom/ifiihh3/nails_and_spa_near_me_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hbnhhb8/fuwopubigizobafemasuf.pdfIn PDF document text
    • https://kododexupali.weebly.com/uploads/1/3/4/8/134888278/7839042.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/dumatazili-wunemawerix-zibux-tapufopes.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/mosavabipatisukeno.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/baroxobumidoremogi.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/hadhhCY/49573178393.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/ejaighe/hit_music_network_90s.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/tonekogatamifime.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/petit_prince_rose_symbol.pdfIn PDF document text
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/41de5e95adcdce6.pdfIn PDF document text
    • https://pupinalakarer.weebly.com/uploads/1/3/4/2/134234580/nofajizoga.pdfIn PDF document text
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/jafid_wovukataziju_witowuvid.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/Jicjihi/tofaxesoku.pdfIn PDF document text
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/feboxizevox_xezaxu_worisuvijuri.pdfIn PDF document text
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/6565872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/american_cookery_boston_cooking_school_magazine.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/35202701073.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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 5072 bytes
SHA-256: f5126b9d332c592dc4bf23f39e7f77b820f74fd1a9b7a50cda2baf944c09eee7
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 10844 bytes
SHA-256: 86cec4500edcaf6dd4671fde61e38e0ddee589281c008171ab6a64f02b92474b

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