Malicious PDF — malware analysis report

Static analysis result for SHA-256 8464f95c2ff77d89…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 04:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d88fd55d4798c699ec9c4d26a1881f9 SHA-1: 955a213d3387b82ca0b4d34994542b31ae85ca13 SHA-256: 8464f95c2ff77d89f291a34395614737d60e9604e3b437d4b6975cbb889bbc77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to external, untrusted sites.

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 https://smidgel.ru/uplcv?utm_term=android+phone+problems PDF link annotation
    • https://khmernative-rice.com/userfiles/file/giwakavilerozobumevowibov.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/fatimexipikafululo.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/lumuj.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/luwur.pdfIn PDF document text
    • https://phunhai.net/upload/files/42682066329.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/88964138225.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/rojaro.pdfIn PDF document text
    • https://elemonbg.com/Files/File/lunawokudinuse.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5624311---14834022842.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/fukejitime.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/vafasitojunukumeweras.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/92620067499.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/20dc4cb67441f3c36df61f86ddecd6b2/16581924724.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/rafinibipukuzi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/setosurigi.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/pokilur.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/niraja.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/fasatexipesapopizefalo.pdfIn PDF document text
    • http://tiquital.com/documentos/file/99645495685.pdfIn PDF document text
    • https://penal-garazh.ru/files/bilevizusorikaja.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/fasumowesefefaku.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/ribam.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///38121824614.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/vutopikir.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 17620 bytes
SHA-256: 60d8d808242ed91bd56e5cc1a69fc610c6af6aceaec06bdf394a8a263508aedd
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10516 bytes
SHA-256: fa73036edf2f4539ff43a7bbc8f0747f1ffb9721178207129c0908e7d7fc9551
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1