Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f338d0c47557ace…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 03:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b020e18f9449d6f90016f24f7ef57c33 SHA-1: dcc19b971a1f42d58eaa1f0059c9c63bf9d0cdb2 SHA-256: 8f338d0c47557ace1da740702c3fb89ddc90e57596cff51d4b1477efe4ce056f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs, such as 'https://kuzutuzo.ru/aws?utm_term=why+is+my+mouse+scroll+wheel+not+working', suggest a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to lead the user to a compromised site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=why+is+my+mouse+scroll+wheel+not+working
    • http://pixunune.sportsontheweb.net/widumumezalatipilutixid.pdf
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/7666399.pdf
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/zikab-naforibi-xanigileg-fotorirujibab.pdf
    • https://zulezinema.weebly.com/uploads/1/3/0/7/130776370/rumovol.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/6328651.pdf
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/35b33eb38532.pdf
    • https://cdn-cms.f-static.net/uploads/4460968/normal_604207e06c1dd.pdf
    • https://static.s123-cdn-static.com/uploads/4369900/normal_5ff98026e8f51.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600aba3a7ab8d.pdf
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/wigila.pdf
    • http://fumuroruzej.medianewsonline.com/bursary_motivational_letter_sample.pdf
    • https://bodovusinorone.weebly.com/uploads/1/3/5/3/135347185/9876519.pdf
    • https://cdn-cms.f-static.net/uploads/4426423/normal_602a19a15f866.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunojipu/96105585179.pdf
    • https://s3.amazonaws.com/bededuxotulapil/tudeluxotefadurozerim.pdf
    • https://s3.amazonaws.com/jenisozazewubo/the_abbasid_revolution_shaban.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/chamberlain_myq_wifi_manual.pdf
    • https://s3.amazonaws.com/gurowozenupifi/uk_penny_coin_value_guide.pdf
    • https://s3.amazonaws.com/tuxutedi/la_metamorfosis_resumen_corto_del_libro.pdf
    • https://s3.amazonaws.com/fidobakipivogit/the_immortal_life_of_henrietta_lacks_chapter_10_questions_and_answers.pdf
    • http://sovogezo.atwebpages.com/acer_aspire_n1996_motherboard_manual.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/lobuzimizisugog.pdf
    • https://s3.amazonaws.com/xabalaru/free_browsec_for_opera.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4e.bin
327ab9810fba565a2025dee1251f37117f82e134809af685aad33e4c1437a931		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5276 bytes
font_01_sfnt_off0000fd38.bin
fad51039e830694bcb36b65d4e90bfd8cce670af084c8f522399bd2676f7feb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 10588 bytes

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