Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adb8fe79f6fd8c4…

MALICIOUS

PDF

63.8 KB Created: 2021-01-16 13:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8cefb12372ae634ce70617937fa055f3 SHA-1: d67bf00b952f88a2ddb014f6f820fc12a7e13454 SHA-256: 5adb8fe79f6fd8c4d60af7c3d5d8252f066ddf185de7898c1193812c55998a62
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to direct users to potentially malicious or phishing content. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=uml+distilled+pdf+ita+download In PDF document text
    • https://lonojoxojiliw.weebly.com/uploads/1/3/1/4/131438577/1975925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479679/normal_5fab20d35d279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_5fdb2456e4d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fbf89a99a5e6.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/revun.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/satim.pdfIn PDF document text
    • https://mogiveruxapexi.weebly.com/uploads/1/3/0/7/130775775/1677372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_5fb4af829ff92.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/rukutasifize.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/jixeremipet/jamapimabug.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/89700510837.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/c._o._b_full_form.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_off0000c01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 5176 bytes
SHA-256: 6561ecbd1dec5874d5e4f9f873c7b8f0b6a3012deae6fdad496197a726831ff6
font_01_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 9620 bytes
SHA-256: 0f95ae22bc341b13b838be6b1a17a8b3d0d65ddf62d616a7922ee878fcdc74a0

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