Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a136fa3eea2d56…

MALICIOUS

PDF

73.6 KB Created: 2021-03-05 00:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e99bec673db76a791eccd38fbec52c55 SHA-1: dedf0f447a465214efe5ecf5923d184a5ec508c0 SHA-256: a2a136fa3eea2d56a0645db7527086dbf9ffd56b7f26262e0c248290582b2105
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the embedded links likely lead to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=how+to+connect+hp+airprint+to+iphone In PDF document text
    • http://es50off.pro/beyond_the_wall_rpg_playbookskfyfd.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/nuzitumew-toniludid-zimorokapuji-tanewezofelu.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/dorekon.pdfIn PDF document text
    • http://termometr-medikal.site/17247927862ogbo3.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/9425390.pdfIn PDF document text
    • https://jubagidegugidok.weebly.com/uploads/1/3/5/3/135317658/welesuripiv.pdfIn PDF document text
    • http://nudistoff.club/90856457293xwxl.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/deroluziguwitikut.pdfIn PDF document text
    • http://jobware.pro/antecedentes_penales_colombiab8iqm.pdfIn PDF document text
    • http://topstudy.fun/formation_agent_immobilier_alternance_toulouseyozap.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/7bce83bdb3f1b.pdfIn PDF document text
    • https://kewidavarij.weebly.com/uploads/1/3/4/6/134696647/nujamise-xilivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixajek.epizy.com/tom_sawyer_theme_song_lyrics.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_f3ff437d717d43ce97d9819e43b003c3.pdf?index=trueIn PDF document text
    • http://tatinovewetede.rf.gd/tc_electronic_hall_of_fame_2.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_40d2bf7b8d754386a90b3e74ac42391f.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_0bf24bc379cb4a76b938c6eb1f70217d.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_08cc0b7688b54457b23931e70ae876f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/dekefotuk.pdfIn PDF document text
    • http://topunofiw.epizy.com/petaluma_city_schools_bus_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/94268490007.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_306b20c38c3a4d458c00acbd3b9f98b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/anaconda_3._6_version_free.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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 4864 bytes
SHA-256: 11f5d35bccf06ac775a2a7ab78bdd8a586201c991f77b7d147396bd8c68eee9a
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 9896 bytes
SHA-256: 5a67598ebb6a3050000851fb7d38e10c31169e9947b4ccadc9ad26d980102bf2