Malicious PDF — malware analysis report

Static analysis result for SHA-256 454b47a6a7a732dd…

MALICIOUS

PDF

82.3 KB Created: 2021-03-01 02:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2a0e470d2132d3ccdc38371171aa1714 SHA-1: 212bbc75a7e6d82337f51bca242a9c12901fb69d SHA-256: 454b47a6a7a732dd0a0b9cfbf166f5241dfd715c8d2409a9ee1d7c421a5c1447
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/wix?keyword=heo+quay+chay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389361/normal_601e252caf4a5.pdfIn PDF document text
    • http://manthoughtswebsite.website/abstract_noun_worksheets_for_class_8shw2k.pdfIn PDF document text
    • http://eurofamily.pro/how_to_describe_your_lovers_eyes9ot86.pdfIn PDF document text
    • http://ductsunlimitedins.com/zorosozad1svzy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458145/normal_5ff0dfe1e959b.pdfIn PDF document text
    • http://marketitaly.info/what_do_i_do_if_i_lost_my_p_ebt_card2dvb4.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/5059836462.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/58199649143.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/3343463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_602a19a2e1b5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://jatoxat.atwebpages.com/safety_first_guide_65_convertible_car_seat_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/96863945511.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/15305805763.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/ditisanu.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 3056 bytes
SHA-256: 1aa0e4c2a5c53110641ca002a97b570172017fb37d29763c15f35f9b3bc5f45a
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 4768 bytes
SHA-256: b7bf6d98fd5ec2e9b2f9d444d6227bf2adecabd89099c9a4599375bcd3550962
font_02_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_03_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 11012 bytes
SHA-256: 9d4d19bb61d18e5f43f5158a98c8636a66b8c742e3abba7d7d17b648c8f0e138
font_04_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16684 bytes
SHA-256: 4fb18f2f8d176c0c9ddf893a3a69c6eaaaf8ae8309617b6e07033971a2ed751b

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