Malicious PDF — malware analysis report

Static analysis result for SHA-256 25314096ac81c11c…

MALICIOUS

PDF

80.1 KB Created: 2021-05-20 19:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 36195cf53e25827962c26f832a1c7b85 SHA-1: 7db60585802b6eb921fc0a5b24148a3fb6c42fb7 SHA-256: 25314096ac81c11ca82f627eb9580bdef6959896f564f0ccc2a7e4c71ba058dd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a URL with a 'how to get free gold' query indicates a lure for potentially valuable in-game items. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=how+to+get+free+gold+in+adventure+capitalist+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fcaed9b5f243.pdfIn PDF document text
    • https://miwozomeme.weebly.com/uploads/1/3/0/7/130775979/sudajadikemananuwot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6048ec3789bfe.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/bufedaridak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_605b04a22487a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501385/normal_60012bc870cb7.pdfIn PDF document text
    • https://rovenefewapug.weebly.com/uploads/1/3/0/7/130775308/270ecc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_602a7aba9aabf.pdfIn PDF document text
    • https://mofomajem.weebly.com/uploads/1/3/4/3/134349017/6021356.pdfIn PDF document text
    • https://mufebukevep.weebly.com/uploads/1/3/4/0/134096334/5089314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_603ef243a6dea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b9a698-7f25-4167-9a84-0f7750676ce6/why_isnt_my_ceiling_fan_spinning_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53698df5-2e24-4f7f-95d3-b5f8acc46ac2/93125386965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6bdf93-a510-4570-85bc-352b8e03ce06/how_do_i_setup_my_parrot_ck3100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975b1a08-1e0b-44c5-82fb-c62bbb84a8e7/fujifilm_finepix_s1500_sample_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4de00b4-923b-4bd1-afa1-46e068583844/77247968699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfaba1a-de84-4889-a1ff-8c0760d4c13c/44831812676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871de068-5a48-45b9-90f8-bdf890139c33/the_secret_garden_story_chapter_4.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/22738375598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd92e8f8-ba9f-4676-a15e-153c92aaf870/80899532709.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/96561424656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f13b6e-5faa-4c14-bd3d-2fe8c95543f5/75110482307.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
    • 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_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 5524 bytes
SHA-256: cffb4964d25637f643d89c8088fb9fc697513159cc5c1a2900c65f99f41870ed
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 10836 bytes
SHA-256: db83884aff95e22c356afcca24c4a705b1106571865a47ef40d0dc8fe5436625
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f