Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ce090a3da17004…

MALICIOUS

PDF

77.6 KB Created: 2021-03-16 22:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 32bbf02c85253f3f8109eb7305b14a86 SHA-1: 21e06df49034094a867716c36d1eff5e87209d42 SHA-256: 34ce090a3da1700489d5480916f39b1c6c8b2b09c8964b6c88f8415d6627040f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to direct users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/award?keyword=class+11th+chemistry+formulas+pdf In PDF document text
    • http://scrlt.xyz/extenuating_circumstances_nottingham_form85iq7.pdfIn PDF document text
    • http://limaxinsto.xyz/66481309999xvjq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fc81366c8129.pdfIn PDF document text
    • http://trokot-shtorki.online/nut_hunt_gamex93yw.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/81699871384.pdfIn PDF document text
    • http://robinmani.site/teduteteryvuis.pdfIn PDF document text
    • http://sravniproxy.info/finedevome9d4am.pdfIn PDF document text
    • http://petersikdar.com/wexetatetutirb4aq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5fecf19593ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fc69d92a6045.pdfIn PDF document text
    • http://ebay-coupon.ru/zomojikojivikekebu16wjs.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/tipikaxe/74440468686.pdfIn PDF document text
    • http://sifuzetijo.rf.gd/appraisal_answers_for_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/pegolovagul.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_0660790af13b4620afee2631112bf023.pdf?index=trueIn PDF document text
    • http://xirotowukutizu.epizy.com/2006_honda_odyssey_alternator_rebuild_kit.pdfIn PDF document text
    • http://fepesori.rf.gd/15184370499.pdfIn PDF document text
    • http://suxukapuvajobe.epizy.com/sukus.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/probation_progress_report_template.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_488b335fc7884e7a9e7f6079154d5eac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/92253789804.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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5452 bytes
SHA-256: 0df2a26a269e96eeda0b98f18e9796dc21c908295cbb579cfa4b6f70167606b9
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10592 bytes
SHA-256: 8a5cb4c77a3a60ecc20ee5600dad4bd4530aadf92a99c4f47c926399ed1cc99e

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