Malicious PDF — malware analysis report

Static analysis result for SHA-256 9887ba823991521e…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 10:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d12aa70df5747f6d6f5d82940f38b82 SHA-1: 4182413f0c7250482ebdeb7e5e5a48b2dd336bfa SHA-256: 9887ba823991521e45fe6a71bea3e292837b0c0645735bd73e441656dd75fa16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating an attempt to redirect users to potentially harmful websites. The presence of external URIs and the link farm heuristic suggest a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://auto826.vnpec.xyz/uploads/files/136556530.pdf In PDF document text
    • http://abwmountvernon.com/uploads/files/19419926996.pdfIn PDF document text
    • http://cocoal.com/uploads/file/gizixibo.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/19108175401.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/bedifewisulimuji.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/56761264434.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/87900184553.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/xejufuxozisixuwegun.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040851141587.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/dalaxurixamumegibunarapez.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81512475874.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/vodalupudasuguxu.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/25083167622.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091602041570.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/44314561635.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/gafelizevadajevonaxupono.pdfIn PDF document text
    • http://njchemland.com/upload/files/52296035809.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/tulisuteroxujevole.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/82519726692.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jozefimulotigatumu.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/forovaredevawabun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wwe+2k15+apk+free+download+for+androidPDF 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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 10704 bytes
SHA-256: 1fa3c93951d04f60c4c3250ce18f8236f9dfc86b23d8483808c556349a11625b
font_01_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 16432 bytes
SHA-256: c3cdedfeb80e6177fde84725c1a4c015431ccd41dd98d89ee99c81812d3b133e

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