Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d1318571b06ec9…

MALICIOUS

PDF

76.0 KB Created: 2021-05-08 10:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 512b57d0a6a8137ee049f2062080f006 SHA-1: 419130ba3c686a7d9b7147a5b524794a234da5a8 SHA-256: 13d1318571b06ec9240330c94e0fa7657386ff888d397c59ba0bcc7f0c3a45e2
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of numerous external links suggests the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dafemum.ru/strik?utm_term=samsung+vrt+top+load+washer In PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/pevametapalebe.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/4O9hcji/abcmouse_early_learning_academy_app.pdfIn PDF document text
    • http://starconflict-game.ru/king_james_bible_onlinetdyld.pdfIn PDF document text
    • http://pubofumoxo.scienceontheweb.net/reading_passages_grade_6.pdfIn PDF document text
    • https://lifinupal.weebly.com/uploads/1/3/5/3/135336288/4342240.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/EhdDxgj/switch_scanner_apk.pdfIn PDF document text
    • http://p-kavkaza.ru/walmart_green_supply_chain_case_studyh50st.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/cJieNR6/philippines_cell_phone_prefix.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/9267613.pdfIn PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/vutitozi_xonez.pdfIn PDF document text
    • http://hyipinvest.site/irobot_980_review67nwf.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/wonodizuloxob.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/5icjhlx/26826369717.pdfIn PDF document text
    • http://prizinsta24.space/tewepine17rkv.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/xelutodimudiwu.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/pigolo/apples_and_bananas_education_answer_key.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_e1c9022400544cb0959e790dadc65a91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/amazon_business_case_study.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_e86a3fe043464e1aa2126f15b789098b.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d82359b35a8f476a9020a724571d22a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/b._ed_admission_form_jiwaji_university_gwalior.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/tetelanefepumana.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/crossword_answer_for_british_verb_ending.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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5628 bytes
SHA-256: 4115e5b3e67fb5bc8f9d24365bec6da87d20da1a13806d99899dd95d9bb0c973
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 11420 bytes
SHA-256: 453350ad5fd8ca3fc843da95264c8ba066efff0434be02e86eb60a4f289de616