Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6ca3acb38ed9df…

MALICIOUS

PDF

68.9 KB Created: 2021-03-01 06:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 94d9cd99c770ff10145d81ae4a8130af SHA-1: d543519eef20003364ab6f906740d4c5307e705b SHA-256: ac6ca3acb38ed9df6241cbd2ae5227c56b4e9d82259bff7172285d103ab5f730
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, including a link farm, suggesting an attempt to redirect users to malicious or deceptive websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a high likelihood of malicious intent, possibly involving embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=mens+lace+cheeky+underwear PDF link annotation
    • https://cdn.sqhk.co/befozaxulot/cifVwgg/tibezimepofezapupap.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/rijipogodusofufo.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/vRifqEX/90276807435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_601ebef27b806.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/how_to_reset_answering_machine_message.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5ff5a96cb8415.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/pasawexawinogad/i_am_not_perfect_but_i_am_honest_meaning_in_hindi.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/boards_and_beyond_step_1_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/8904127087.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/steelhead_fishing_guide_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/google_chrome_for_windows_10_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/tiwonozosojor.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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 5292 bytes
SHA-256: fe4a3ff6386e1d368c34f7bc9f8f4af614325c8b2aa31b2724699ed8e35f1f53
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 12648 bytes
SHA-256: 5b0b429d3f1b5925fc7fe39730c3df1647f1577b81db27a047e77cc3ded9a587

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