Malicious PDF — malware analysis report

Static analysis result for SHA-256 1728d04875c08acc…

MALICIOUS

PDF

90.2 KB Created: 2021-09-11 03:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 944e800bab1a0940b58321306d2f463e SHA-1: 162b33736c782c2d9ae14ee99d9b0298ae399110 SHA-256: 1728d04875c08acc8680ad8a1a8407ba8e551fe48d5790f72750d8ae97f4491e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crysiq.ru/uplcv?utm_term=what%27s+facetime+audio PDF link annotation
    • http://haraj-alqunfudhah.com/userfiles/file/fopamuj.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/55248274829.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf1ddd57e---bigumapedejevafipe.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/xufejewujovojunejugexajiw.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/komibatunepeginigexi.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/zaselavu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/nevusaj.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dojurepifadidugevofumaku.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210905115205.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/jagirixazekatizes.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/56549862448.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/19073317095.pdfIn PDF document text
    • https://ubranni.com/uploader/files/fibevukekumakajuzanamor.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/dagovefumube.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/32129026757.pdfIn PDF document text
    • http://taxfreepoint.com/file/lejavedetavonuwuz.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88330975303.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/kaxopixavanidedinikiwosid.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/99183116334.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/4700825912.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/voxigidavetu.pdfIn PDF document text
    • https://istanajp.net/contents/files/buxosolesesafe.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ir8occjj60prrq8hlvvgt5co21/sedutubawobibas.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/78584357018.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/61712690155.pdfIn PDF document text
    • https://zagi.hr/files/99475819162.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://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_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 10620 bytes
SHA-256: 5978c17b68724859bbcac1072748959bdb9eabdfd98dafb04e783c6403312f2b
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 18192 bytes
SHA-256: 79e3b58f3a861ad656266c0c0a78b9f4ef7567886887f0e481bcf1fc923ffae4