Malicious PDF — malware analysis report

Static analysis result for SHA-256 890782eb0af443a2…

MALICIOUS

PDF

70.2 KB Created: 2020-11-12 17:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7bc4e7090c7021b5f6f1671297b47cc7 SHA-1: d6df7bbdc4b7d01db865b27532fdcedfbcdec37b SHA-256: 890782eb0af443a2948471c95c6fee4b69b5decce5adf60d024350abac9ceb3e
262 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The presence of a 'download button' lure and instructions for a password-protected archive suggest a phishing or malware distribution workflow. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/strik?utm_term=tstc+moodle+harlingen In PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/8449992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_5faaf4bb54e0d.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/kuvawidifakurabebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f97490ecf180.pdfIn PDF document text
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/6a6b3a22ad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8e256491a22.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/e534dd694906d3.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/499d644e10d.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/durixuxamamub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/juwikimezam.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/73585782397.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/98367216989.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/conservation_of_biodiversity_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 5088 bytes
SHA-256: 02b4fea742be47df26d15eacde007f79413ca4158ccd7af71868e0637247a5b1
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10324 bytes
SHA-256: f329b26066dd61f0d4d0757f3f3f308a099639b69509573edd07f9aff2dd142d
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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