Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e5042ad642991…

MALICIOUS

PDF

92.0 KB Created: 2020-11-25 13:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1378943f4304f01b37126cb5f37b4130 SHA-1: d59daf5d71f12408a679267b24e42217eed45e97 SHA-256: a99e5042ad64299170e41be66910274bbfd67a8f0fe7bca2e023b6bdfefe2531
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal that the PDF contains a large number of external links, characteristic of a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=jose+el+profeta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473415/normal_5fb81aac0e9f7.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/8487090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_5f9641e876683.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/fakij_duratinen_pufomamenevine_wegodonusevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5f8d619094c9d.pdfIn PDF document text
    • https://pakovabe.weebly.com/uploads/1/3/4/4/134442852/85e763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_5fa57fcaf4238.pdfIn PDF document text
    • https://jowojebutoda.weebly.com/uploads/1/3/4/4/134487303/nerarokovuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f8bba12c3b63.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/4489596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001398a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1398A 22660 bytes
SHA-256: 1c4d1cdfaa10fbbff036c52e77fb57738f3a60e6a5da1f69ec80d7e6f3e04f1e
font_00_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 4884 bytes
SHA-256: 08bfc477d72c1b5221883071ce1cf4f16fd240d73854196cce7db3e3e1dfd77b
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 14400 bytes
SHA-256: 99bbe22292ca152141db14883511705a543c27dc27fea9bfdc19fb30c724913c

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