Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5519f31134fa88c…

MALICIOUS

PDF

79.3 KB Created: 2021-04-27 00:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e19b300e8b2ba643c911606c570686e1 SHA-1: ee3356b52d9628af8ec0e909f989a61738a626fe SHA-256: e5519f31134fa88cd09da198ed283983b85e9eae1076048e3c15263387b6b022
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=what+does+crossfit+do+to+a+woman%2527s+body PDF link annotation
    • https://xudixakutax.weebly.com/uploads/1/3/0/7/130776611/sawamex_zuwaj_wogekezi_zujomogo.pdfIn PDF document text
    • http://telgrm.site/forigivavugulnglx9.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/6604506.pdfIn PDF document text
    • http://center-about.com/calibri_bold_regular_font_freeeu2j7.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/6984505.pdfIn PDF document text
    • https://jerepuda.weebly.com/uploads/1/3/4/7/134745202/59b54.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/days_of_the_week_and_months_in_french.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/microbiologia_veterinaria_stanchi_gratis.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/40009338360.pdfIn PDF document text
    • http://fijazubelanulek.mywebcommunity.org/71334002648.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_26930a42916f47be894f17e44c48f7ec.pdf?index=trueIn PDF document text
    • http://xifimerin.onlinewebshop.net/chinese_language_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3907fd2a-72eb-4af9-a5ba-49e4cb04ffa7/rmv_road_test_application_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9970c49c-a245-4c58-95e7-d186dcc45fdf/jardine_crib_conversion_kit.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_a7a40cfbaf7a47ac9de378198ddcecc1.pdf?index=trueIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_1388c20b5cfe4adc9d79694b4ffd8bb4.pdf?index=trueIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/possessive_nouns_list.pdfIn PDF document text
    • http://nudagimanefej.atwebpages.com/causes_of_lung_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e0de31-b998-4e2f-abe4-58d4a146cfc2/zakimurofesegejizaziwow.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_826163b9831c40599b6451d788321758.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98d521b-b11c-4f26-811d-4a0c3d3cbddc/how_do_i_keep_my_inflatable_mattress_from_deflating.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5612 bytes
SHA-256: c8325732e25052d5329e860cf227595bd737d623937db2abf3d1d7b33d533139
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 10452 bytes
SHA-256: 90b2c859ac605f3444f014dc0b5265f40d8fe09e1c18a1dbce394e20dfa2a859