Malicious PDF — malware analysis report

Static analysis result for SHA-256 5042cc1313523b3e…

MALICIOUS

PDF

84.5 KB Created: 2021-10-16 21:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74952b4367aa67b8aaf92053eba1aa11 SHA-1: 9873f32205c710596adcf6f997b4c61cab51a2f4 SHA-256: 5042cc1313523b3eceafe0ecf0538f084f1dafe8e4365b0efb5f4e0de0d6aca8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lohoithaiduong.com/uploads/files/bupabeganovavowodamo.pdf In PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/87295465295.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f7beb80fe0a2caab1ba279ef52accb1/33390586582.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/lujabajufabuvebimaxel.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912205911.pdfIn PDF document text
    • http://coachhouse.info/assets/file/60145241638.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6145A9A9E7F38.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/zizugonajonegovipesedaf.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/36175977232.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0cehteogvervu7ue4vnct1ido1/tulafixoda.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/72723837814.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/55640576546.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/52808483114.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vatuzuvibi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/datodupuxaguta.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/88920867822.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/segejororasigavulet.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/jovebug.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/41793236488.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/82014468745.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/25854295291.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/zenazuz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vesudupisifemalofiwixeje.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/82930479193.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=extreme+riddles+and+answersPDF 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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10460 bytes
SHA-256: cbde7d973cef18bdce4f930a7ad646e4689553e89d6492b81949b0567aeafc7c
font_02_sfnt_off0001173d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 17408 bytes
SHA-256: ea1f552d0e2ae01af915548edf764e0cd3c82b3f4fcb666fd075fa710379c3ae