Malicious PDF — malware analysis report

Static analysis result for SHA-256 c912d0b5727314b2…

MALICIOUS

PDF

76.4 KB Created: 2021-02-25 00:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 795083da97e0094c834e6f0e952571ce SHA-1: cc84e878777caee5b9367c3df872ce70aa9df939 SHA-256: c912d0b5727314b2aea208fc052409ed12d88fa46027e0089b3cf14253f545b7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=native+american+menstrual+hut In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fe50e93626c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d5eba3f007.pdfIn PDF document text
    • http://qrastenmap.online/76455245742mxciw.pdfIn PDF document text
    • http://jushq.pro/vuxikowovewekogerovaw6pv3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5fc5f53d941c0.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/f33e8c5eb6a1b4.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/cVyijhs/46646433114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414695/normal_6036cce11744f.pdfIn PDF document text
    • http://eslivdrug.space/pinugomexesokmx6a.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/jusagi/coby_wireless_headphones_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/61762559444.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/platform_ankle_boots_new_look.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/boxekeduxeruda.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/android_studio_apk_name_change.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/class_d_amplifier_schematic.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/kofukupudem.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/dilalomude.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 5068 bytes
SHA-256: 24901fcc441d3834edbbee5ee0269a4d8b8bc269a2dde08b643782277ad79582
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10272 bytes
SHA-256: b8508a999e3d9b516bf394608daa051550c8c67de9b2b5cf3ad917a8179c2fba

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