Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c124a7ee9677c95…

MALICIOUS

PDF

68.2 KB Created: 2021-02-21 06:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f27756aad863396e3a4dfc6fcb209cc7 SHA-1: b1b44427a3989ced84a80451d452c76e02dd357a SHA-256: 7c124a7ee9677c95f804d67dedd9ad66a685c27809a773973c873ecc8dc98d20
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is used to distribute malware or conduct phishing. The document body, though heavily obfuscated, contains text related to 'Iphone repair manual', likely a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/wix?keyword=iphone+repair+manual In PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/7731282.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/ffe3a4206e9.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/gakimebijilegop.pdfIn PDF document text
    • https://tazanuna.weebly.com/uploads/1/3/5/9/135977230/redexedokifawaniduwu.pdfIn PDF document text
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/wutovibezasetu.pdfIn PDF document text
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/fb6c7d2de6304.pdfIn PDF document text
    • https://tigoxugijiwubaz.weebly.com/uploads/1/3/4/3/134315710/8941500.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ijczrdy/tasty_blue_unblocked.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/30e25.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/good_android_games_without_in_app_purchases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifagugurubox.rf.gd/an_inspector_calls_film_1954_cast.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/arabescos_vetor_free.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/administrative_approach_to_management.pdfIn PDF document text
    • http://jelazib.epizy.com/sazeroz.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 4820 bytes
SHA-256: 1f2650ef9c07fb9fff2bfef368c0b392c518ac7d12810c14d6eea4d5c0df4990
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 10200 bytes
SHA-256: 59504a7c1d209b1963c9463048574fab083798fb2e80a7e3436772d43c96bb21

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