Malicious PDF — malware analysis report

Static analysis result for SHA-256 9572e428bb51cc10…

MALICIOUS

PDF

79.1 KB Created: 2021-03-31 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3aa59e86246e0637b7494a79bef4ee63 SHA-1: 37a669a100058607993c22b736a881abd766f3b9 SHA-256: 9572e428bb51cc10e1d6a41a64da5645317f1c020a70278717af7cd2055aea0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains text related to 'position paper' and 'wkhtmltopdf', indicating a lure to disguise malicious links. No scripts were extracted, but the presence of numerous external URIs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/aws?utm_term=what+is+the+importance+of+writing+a+position+paper PDF link annotation
    • http://tuvivukaroj.mygamesonline.org/12866761441.pdfIn PDF document text
    • http://hhizmet.com/paguzovolobiwagalulukividr4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494866/normal_5fc62e3fb9a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383571/normal_5fc9789a91e19.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/jhhaddC/soccer_heads_2_player_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/juidhgg/16321799457.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/hbhdKTj/costco_egyptian_cotton_sheets_recall.pdfIn PDF document text
    • http://digitalmicroteter.xyz/around_the_world_in_80_days_book_reviewqk7hv.pdfIn PDF document text
    • http://bigakeka.iblogger.org/betomoxonelu.pdfIn PDF document text
    • http://carinsusa.info/fibevixe9xrau.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/fYzCgeu/8805604249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6034261c88130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5ffe4d0054a43.pdfIn PDF document text
    • http://d2-club.ru/effects_of_social_media_to_students_in_the_philippines0lmw3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilexaluv.epizy.com/vexesafatebapap.pdfIn PDF document text
    • http://gokixedotoj.epizy.com/mebekuxefovoledepabeme.pdfIn PDF document text
    • http://favubilojoko.rf.gd/soxaxowuxulazekujujadaj.pdfIn PDF document text
    • http://ralemagafi.epizy.com/kijupifivewegaberugepi.pdfIn PDF document text
    • http://romapubimowa.onlinewebshop.net/bhagyalaxmi_calendar_2020_kannada_free_download.pdfIn PDF document text
    • http://jonegukum.epizy.com/dabusunevak.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5504 bytes
SHA-256: f232e88e3afccb03658499660e19d92d86655bcbf4f800e85925e75c5d381acc
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 10832 bytes
SHA-256: f45ab273bca9072593819cc180ef7042de0d7dafb75948be8b0b7b84a8642cba

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