Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d5163582eca13d…

MALICIOUS

PDF

69.1 KB Created: 2021-03-19 04:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8f0a50e3a4b0627316dad643131e9c5 SHA-1: 37ea48d29ba9645ae1450ebfe0fbb159b8583018 SHA-256: 89d5163582eca13dbd0da05f4be5ea86744c7b6f9446a30882b74beced83654c
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic to distribute malicious content. One critical heuristic indicates a link to known malicious redirector infrastructure.

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
  • 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/123?utm_term=deer+fursona+ref+sheet In PDF document text
    • https://cdn.sqhk.co/liripudeb/dvp3H1m/dragon_quest_9_remake_2020.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/family_feud_rules_points.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/troy_bilt_lawn_mower_belt_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/molofagaji/eXjeNgd/telecharger_whatsapp_apk_derniere_version_2018.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/84534932538.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/yzjjhfL/zejirabakitutevewed.pdfIn PDF document text
    • https://cdn.sqhk.co/difakezil/eidM3Fh/risk_matrix_table.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/71050831599.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/what_happened_to_mary_rowlandson.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/PrQgiTg/54472127405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pujusojup.epizy.com/engineering_drawing_book_file.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_1be45cc5d1184d4c90176d57cc030b37.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_6357e6b5a7414a5080daf9d4ae5c3a0d.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_a1155583ba034d609017f75dc9b152e1.pdf?index=trueIn PDF document text
    • http://kimovene.epizy.com/is_college_algebra_easy.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_4100d6043d0c4272b2c9a8186eeec522.pdf?index=trueIn PDF document text
    • http://dexadusoxeb.atwebpages.com/30628970019.pdfIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_14c77e4ab5b74222b068e366e9498243.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC474 4656 bytes
SHA-256: cb7202f41afe4c003ddb817fa46303d1f887fa375fb2e0a5a39648da36f631f7
font_01_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 10892 bytes
SHA-256: 53c93bfa27987eccb2361664b97b61589af72d0f395c9c9bfd3ec2fa62ba9f67
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333