Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac4cbf47b581445…

MALICIOUS

PDF

77.0 KB Created: 2021-01-22 03:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 5a5eba28e3bf0753e40662d94fa020e0 SHA-1: f0d3e351e409bc1de9b4e0460614954294717cd1 SHA-256: 9ac4cbf47b58144538496c83343f83e67714ed7b13ad23565eb6dcc30c53e860
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/aws?utm_term=eiffel+tower+summit+tickets+without+guide PDF link annotation
    • https://site-1207104.mozfiles.com/files/1207104/best_cheap_android_phone_cases.pdfIn PDF document text
    • https://site-1247897.mozfiles.com/files/1247897/adding_fraction_worksheets_with_answers.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/please_define_android_sdk_root_linux.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/823f8.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/87483537415.pdfIn PDF document text
    • https://site-1236897.mozfiles.com/files/1236897/knives_out_cast_meg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitirew/cqc_reports_care_homes.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bridge_rectifier_with_centre_tapped_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/assamese_tik_tok_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/96209693209.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/32463099861.pdfIn PDF document text
    • http://wexugemo.epizy.com/vinonokizufidasalitikoxir.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/assumption_log_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/fuzifadexezoposizojapalet.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/2385381684.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5336 bytes
SHA-256: 596725edd994e12e881a8fbb43ff8da413af5cf75288f2e7dee4a91fe2dabc39
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 10980 bytes
SHA-256: 30350f2aae76e7dd899771c67ef2a66b1bc95c657b731d806f05e0966fa378e6