Malicious PDF — malware analysis report

Static analysis result for SHA-256 212548621f9af9f7…

MALICIOUS

PDF

73.2 KB Created: 2020-11-11 02:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d69843e0b9e69c182371e4975440a1f SHA-1: 122db03eb836fc648af3dd920052ec00413bf8f6 SHA-256: 212548621f9af9f795332ab539d3ddb4a42e8a5ad7faef610968917302b56116
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, with one identified URL being 'https://trafffi.ru/aws?keyword=24+7+games+spades'. This pattern is commonly used to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?keyword=24+7+games+spades
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/disabifasuf_fogiwubidaxijal_vifogove_tapodidoluwik.pdf
    • https://gupasozulo.weebly.com/uploads/1/3/4/4/134471060/volaluneg.pdf
    • https://sitiguzesamow.weebly.com/uploads/1/3/4/4/134401829/kaxarapol.pdf
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f91e8ed2320d.pdf
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f903db200fe8.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fab3333be3f3.pdf
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/bajusafofa.pdf
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f92514c45db1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1531f461-ed75-43bd-8a01-deaa37285a48/asme_bth-1-2011.pdf
    • https://uploads.strikinglycdn.com/files/32485091-1bd3-4b45-bd72-5a582a43f2da/vareguwoladexa.pdf
    • https://s3.amazonaws.com/nokiwovowus/kemopokixikepudaj.pdf
    • https://s3.amazonaws.com/henghuili-files2/vudulozusedudatem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32b.bin
2c87099ac18241f544abab70cbaac84e901337d3a93d344898f179e18f11bac9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 4800 bytes
font_01_sfnt_off0000e37b.bin
92d97390ef359edcf6cc03e978e048613e593ee8ce0a998c1fd2bb516defdd5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 11520 bytes
font_02_sfnt_off00010a77.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 4324 bytes