Malicious PDF — malware analysis report

Static analysis result for SHA-256 3843aa22d5a8e8bd…

MALICIOUS

PDF

120.6 KB Created: 2020-11-22 09:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f53a6c2e2b86570fc3fd73508fc7702b SHA-1: 1adef1ed71724d793982496fc51da3f01eb5d6df SHA-256: 3843aa22d5a8e8bd7932c63bbd99a8e96b6ec38d49eeabe600415f70b59ffd63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on Weebly and other platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the structure suggests an attempt to redirect users through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/123?utm_term=persona+yukari+social+link
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/vavepupiboje-zujesosixerazul.pdf
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fa28cca20273.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8720a3b8118.pdf
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/bf414971.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/66568abf62f.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/eeba43d62994f2.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/mabusukovaladob-saxelijivolagi-demerufoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/feaad719-4b79-44c8-9108-b9664f3538e0/18848392863.pdf
    • https://uploads.strikinglycdn.com/files/836c8ce1-b455-4851-afa1-a7a457f6012b/76924040799.pdf
    • https://uploads.strikinglycdn.com/files/7dbb7b0c-237b-4179-a333-d0cf0dd30adf/nubexagodesi.pdf
    • https://uploads.strikinglycdn.com/files/9beaf35c-e62d-45cf-8843-999e53c9fccf/mofafaxalazijuteretoz.pdf
    • https://s3.amazonaws.com/gurafoga/example_of_diction_in_of_mice_and_men.pdf
    • https://s3.amazonaws.com/lanubili/appendix_surgery_video_free.pdf
    • https://s3.amazonaws.com/baxunaf/xunuwavobesatijapoj.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001814c.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1814C 6440 bytes
font_01_sfnt_off0001910f.bin
74825cfd6cdb9d190388a7e77e85d064d9ed06657523a5fe1dda38c40496ed45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1910F 3236 bytes
font_02_sfnt_off00019cb1.bin
a3e2fa3349a7699ce9fe65eb9a717a9c498e6b59768a9a9264dbede947fd5cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CB1 4960 bytes
font_03_sfnt_off0001adad.bin
4df88fe1f96509b6ae4255d44782dd21762d77b9ac50f47221e848860c5a48cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADAD 11416 bytes

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