Malicious PDF — malware analysis report

Static analysis result for SHA-256 d048b6d2f43c2d71…

MALICIOUS

PDF

66.4 KB Created: 2021-01-15 01:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe5175f8c2ad8c73f392fc29a9ef6b94 SHA-1: 6a0cf4fbbec13b458175d9b956e1bbcdafe3e9ff SHA-256: d048b6d2f43c2d71c18596afeaee76e0a7a7d6546c7a446cf16cc84dcc51575d
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a critical finding of a malicious redirector link to 'ggtraff.ru'. It also exhibits characteristics of a PDF link farm, with many links pointing to other PDFs hosted on services like Weebly and S3. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=whirlpool+duet+dryer+specifications
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/kazara.pdf
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff224da29f1c.pdf
    • https://numobokofe.weebly.com/uploads/1/3/4/5/134501802/37e2915a514ee8.pdf
    • https://site-1217043.mozfiles.com/files/1217043/3234074773.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunojipu/fernando_pessoa_biografia.pdf
    • https://s3.amazonaws.com/wizitifowubux/conducta_normal_y_anormal_definicion.pdf
    • https://s3.amazonaws.com/votawawo/vizig.pdf
    • https://s3.amazonaws.com/vinejivunitego/90920495335.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/space_saver_microwave_dimensions.pdf
    • https://s3.amazonaws.com/posufij/tipubiwavudakebef.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c58f.bin
f56238d374fea56faf0b334922c1cb5557c98eea23f265c48f9bf0db12a8e299
pdf-font-stream PDF embedded font (sfnt) at offset 0xC58F 5360 bytes
font_01_sfnt_off0000d7d9.bin
fa1ad5ef0f156d747685c2c959d311335c1bd1acb7275f6a06d8da717bd9fe92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 10796 bytes