Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9694a6711f1560e…

MALICIOUS

PDF

76.1 KB Created: 2021-02-21 07:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6617caff531fcd2f0159183a144cca80 SHA-1: cf2aead249459a8be8e91ecb1be5f425ea76055b SHA-256: b9694a6711f1560eaa519e565b41eed93144434608cfd58d4fc9e3c89873a6fd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. The embedded URLs and the heuristic firings related to link farms confirm the document's purpose as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=internet+download+manager+for+android+apkpure PDF link annotation
    • http://trokot-shtorki.online/75542218925vufmn.pdfIn PDF document text
    • http://potolkilife.ru/blinds2go_installation_instructionsk8mdx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5fdd14f83dd1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_5fdb6eb0d7507.pdfIn PDF document text
    • http://titoto.xyz/18402595816za41y.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/3576372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_6027aa63edad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6028b2df311e4.pdfIn PDF document text
    • http://forecast.bet/bifogigarupatatijozufaloncouz.pdfIn PDF document text
    • http://stassikorskyi.com/how_to_draw_cute_christmas_things_easyleiw0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_6011284f1b784.pdfIn PDF document text
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/laxufane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_601877a3709f2.pdfIn PDF document text
    • https://togijiwasifuva.weebly.com/uploads/1/3/1/3/131398416/xugekuxo.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/75459929555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_601594bec5744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_600e8531b4754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ripifozuj.rf.gd/zasugerojelefofivofatake.pdfIn PDF document text
    • http://pidezesu.rf.gd/issues_in_education_school_reform.pdfIn PDF document text
    • http://sexikiti.epizy.com/tomtom_watch_strap_size_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 5156 bytes
SHA-256: 2ef1c0e81b98413c0a8e765d0e684b34f289fa387901fa6098636be2b1931ae1
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 10072 bytes
SHA-256: 86a0b27b0e960998ec320f6f4b85946099d09b23d13c2c7e1ed91729f62b1197
font_02_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f