Malicious PDF — malware analysis report

Static analysis result for SHA-256 100eaa5778dc2461…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 01:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72ab10af9b422faa4d7e13fa33f8f5bf SHA-1: c494fe55d598f6a49fe422438ceee5b6e7680392 SHA-256: 100eaa5778dc24617592d8ed7ed137c7c736772d9f7d21f6e05b305e5c6633ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious content. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://hcwan.com/userfiles/file/30235723724.pdf In PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/16502618884.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/2505331724.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/demirilusozu.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/26257083204.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4396ba988b1273ad90e998115777590d/dulusilari.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/80256613392.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/rozumuvipapuvop.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210914063812.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78601136387.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vaxapujanuwigo.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/3221629679.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d77d38a---fefifafi.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/xakataburigepasojo.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/papefumewawetine.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/52761579567.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/zebemimuvibosa.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/rebex.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/83252178428.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/zipatotubazofoxikep.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nozugemon.pdfIn PDF document text
    • https://superpart.com/files/3985681771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=my+hero+academia+season+2+gogoanime+dubPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 19832 bytes
SHA-256: ebd524f94bfc13dd2b468528ee7c0859ecfeb85d805b5d85d8ef197921d0327f
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 11140 bytes
SHA-256: 51905a8847f603765f8ed9fa21d6b567bf43072a154e0deb90aa53fa891cdeaf