Malicious PDF — malware analysis report

Static analysis result for SHA-256 738704ed84f41e03…

MALICIOUS

PDF

88.1 KB Created: 2021-02-26 18:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e69981bf21900a3b5232477d103967d8 SHA-1: e91e2ea458a64492742b34586aed1b4e6f3598f6 SHA-256: 738704ed84f41e034a3354d13bf442250b191d8bd8e69678868324a5308175c5
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'writing a research essay', which is likely a pretext to drive users to malicious websites. The presence of embedded URLs and the link farm heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=how+to+write+a+research+essay+on+a+novel PDF link annotation
    • https://cdn.sqhk.co/ridijafugemi/g2Wshpr/verizon_business_my_fios_app.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/noxijeberogakilexisora.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/cgcbIwJ/chicken_run_2000_imdb.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/misal_romano_espaol_latin.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/jdif3Or/runescape_penguin_hide_and_seek_fc.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/dupapubiferemumusipu.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/gujirawudajewudegifiramux.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/29047009627.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/YMutYif/anime_streaming_apps_for_android_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/RibCBjj/goxafu.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/eoj6iaQ/22747291825.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/free_logo_making_software_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/dahjLic/dufekonujafigemurufodorox.pdfIn PDF document text
    • http://weinmvc.net/42700321903mgfyk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vebavibokifoko.epizy.com/62266883465.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/63404392883.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11019 4888 bytes
SHA-256: 487284b414df1b9a2bbfcb047a18538ba2053e6a888b1447ab000f188e1c4719
font_01_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10460 bytes
SHA-256: 0806ec52ddd79c346d8c85ca8980ea70dc68a81b080ca212e2d9371812bd4155
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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