Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a87449c8c518f05…

MALICIOUS

PDF

75.9 KB Created: 2020-12-31 02:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9fe295b9da859059928aacad1980f88d SHA-1: 5680d837f731d764b53ff1bd143234fc424e640c SHA-256: 7a87449c8c518f055031bc8965afbcf1041b8e0c27de7acb019f3c588949c0a4
214 Risk Score

Malware Insights

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

The PDF contains embedded links to malicious redirectors and a large number of external PDF links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://cctraff.ru/123?utm_term=ronald+weasley+sweater+pattern In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405185/normal_5fcbfa8aec060.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/remuvepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5f95a72f2da97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f9f044a9b5f8.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/miledu/dalafonapewivujusulog.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/14318971177.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/60707405880.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/feels_so_good_free_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/japejejazobiz.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/biology_7.2_cell_structure_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/48448764844.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/true_religion_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/amadeus_file.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5156 bytes
SHA-256: 312a0e2933c7373bc41ad90e41f23c4807b2b205bd5603b7ddc5d126a61fdd3f
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 11252 bytes
SHA-256: 7f68500cb30cfb268030b549e342e00771658fa8400075c32701e978712e890d

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