Malicious PDF — malware analysis report

Static analysis result for SHA-256 def49cb71f4611e4…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 13:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 603e5a6d0f50d78e9cdf7f324083c71b SHA-1: 04bf43966753634034675131e1b6c0a5ce7e095d SHA-256: def49cb71f4611e4e6e385f223a2c4f778f0eedf4add4b5a13ae52d469ae2b25
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains references to building dashboards in Google Sheets, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://zajinet.ru/123?utm_term=build+dashboard+in+google+sheets PDF link annotation
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/xerinozeba.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/a121ddc811c64e8.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/8563136.pdfIn PDF document text
    • https://duduzigofusu.weebly.com/uploads/1/3/2/8/132815892/699ad.pdfIn PDF document text
    • https://zoluvurodozi.weebly.com/uploads/1/3/0/7/130776250/vodapefimov.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/xudorefekivix.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/96509315615.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/55061179177.pdfIn PDF document text
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/wabetagafa.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/pegeroxefakat-nizomugazul.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/9717486331.pdfIn PDF document text
    • https://zezupivipikoko.weebly.com/uploads/1/3/4/5/134596705/zetedijepuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejonaxi.myartsonline.com/medical_laboratory_technology.pdfIn PDF document text
    • http://zakexukosogu.atwebpages.com/73075723053.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/advocare_24_day_challenge_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/97838087393.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_264ab35829304f8eb2b26368e64f86d4.pdf?index=trueIn PDF document text
    • https://9d03b195-5c34-4993-8a23-519dd2bddccd.filesusr.com/ugd/9ac058_fc7a8c55d6254067931ef0b72dbb2cc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/mp4_movies_bollywood_2018_free.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_5d117f47ecb94dc7acc2f86adf4f68f6.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_35d174db4f01400aa763d026d469444d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5276 bytes
SHA-256: 8ed8d97ec79f1d92effc686fd2bbaa334146c7034709fbab32a16aea7219dfd4
font_01_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10420 bytes
SHA-256: 9f6561a6eab73647c75a49c4caf08986fe1b67a6d1d1ba5aecac83fe5c7eefc4
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2