Malicious PDF — malware analysis report

Static analysis result for SHA-256 85aebc1c557c3dfd…

MALICIOUS

PDF

69.1 KB Created: 2020-11-11 21:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 630b78f9fa7b9e7e90d60e8e64757900 SHA-1: d63a9f931652c45a75fe1f099332b67850dbb11c SHA-256: 85aebc1c557c3dfd685ac75ca66eadb11adc61b320be45007eb2346368f78f7d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including a critical finding of a link to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm. The ML classifier and ClamAV detection further support the malicious nature of this file. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=mtg+archenemy+schemes In PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/vomib-zejav-xowunobez-jovifumezumiwez.pdfIn PDF document text
    • https://bameveba.weebly.com/uploads/1/3/4/1/134108569/venaziduzidoz_kediwasubuzud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5fa001f7df7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_5f990e8e2448f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fa0c226a3567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f9a2de4d6e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87585399db0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67967b3a-a710-40c1-ab88-7696741c5ac4/tezapuwopeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96d194f-6d6c-476f-ad86-a54faf2d2287/zuravanebimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e51390-8f5a-4d36-bacf-e79ca897352f/netflix_error_nw-4-7-2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4881e5df-d8a5-4b95-89d9-09126e54458e/keginoragugiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdedaac8-e611-47db-b292-ceaad1bf88e1/55137466522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca9d73f-5679-453f-8310-55a6ccdd7da1/doodle_god_blitz_unblocked.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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 5288 bytes
SHA-256: add0c79dcfd3cac91274d6b955fe19c34ff0423f48832618f7395c45915a4318
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 10828 bytes
SHA-256: db4b0d05fe4a5f86b02a9577ddf7863390b2f1f173ff3d57f03bca9cfd6aee70

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