Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf839b526961b02…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 21:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa3e9a8cf33b64fe84bb696a83eff982 SHA-1: e1d389eceac50a1e1a762a96bbc80c0427044e4e SHA-256: 7bf839b526961b024b82a6e06d3c224e5cc86a2e628e51e10ab05e0461605eaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://infrive.ru/uplcv?utm_term=phone+contacts+app PDF link annotation
    • https://uudanbury.life/files/file/zafejub.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/wiwupunenili.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/divanememolilofosup.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/4743982282.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nemopolilesojuwebawijibo.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54939987951.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/seboraba.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/52652003909.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/lakuzir.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/pujegorajemanob.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/tiribitodiforo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zizujefozowuxagav.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/firisa.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38689214400.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/83532000306.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wigenu.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210912215342.pdfIn PDF document text
    • http://b2cexpressdemo.com/userfiles/file/70835902447.pdfIn PDF document text
    • http://scarpatti.com/files/45067966041.pdfIn PDF document text
    • http://mdtrend.hu/files/file/zejabevifunopuwu.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/64476986784.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/gijagosenawemugosezuwimo.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/44825732118.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/60960010731.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/diwetasaxe.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_off0000b49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 10236 bytes
SHA-256: cbd16f1fd182783fd5631b1c3b1ec748dbe6c2f33a80b2b58788f34c28a7cc82
font_02_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 18928 bytes
SHA-256: 2d6fd2801e4dc5398220d7f8a3beb3b7e45a0059b689bd38fa5af3e6e39abbee

Open this report in the interactive analyzer, or submit your own file for analysis.