Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b89324d8491424…

MALICIOUS

PDF

70.4 KB Created: 2021-04-02 22:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d9509e49be187f84c04bfa283aebbe1d SHA-1: 7fb35b8c9236f17a26b3c64840ce7693d54e4864 SHA-256: b8b89324d8491424d4748aed6593f507b48a9b6a1b0b1d52991766d9e163d967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one pointing to 'fokemale.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of numerous external links, including one to a potentially malicious domain, suggests the document is designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/123?utm_term=dental+trauma+guide+free+primary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5ff5a7c7a68a6.pdfIn PDF document text
    • http://madagelilixo.iblogger.org/usborne_books_similar_to_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fc68bf8904fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_6027f9311617d.pdfIn PDF document text
    • http://gemotebefid.22web.org/free_winrar_for_pc_64_bit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/dragonfable_leveling_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/86455565439.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/rarurememosilo.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/kemok.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/is_forged_in_fire_on_netflix_or_hulu.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/vascular_malformation_brain_radiographics.pdfIn PDF document text
    • http://zolatororulukod.epizy.com/avenir_font_family_free_dafont.pdfIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_bada8a25c6c940639f4f9b74fe7aa0d5.pdf?index=trueIn PDF document text
    • http://mivonovemejited.epizy.com/votezinilegesed.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/jio_tv_all_channels_apk.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_20e0c142470d495b9e261a43bc69be3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/29983405178.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/calculadora_para_convertir_de_mililitros_a_gramos.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/kuvusetupoben.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/xejobodota.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 5284 bytes
SHA-256: beb02a1b11811153722682757148dd2f00d15bb5ff77a1a0e47421ca2b7d6383
font_01_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10420 bytes
SHA-256: 56eaca1521bfaa166a0143d4d6cfd3bc8fdcb3b985420cfeebcc900bc5efc4b0

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