Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cff8cbca15c59ac…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 13:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ec752ff8768319f137d581cd0227017e SHA-1: 821b1ae495ecc2d0675d7d24f8d511d85f87438d SHA-256: 6cff8cbca15c59ac87fba8d726ec5cdbba5ac89501ea19aad2047edfe0f9b16a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. ClamAV and ML classifiers also flagged this file as malicious. The presence of external URIs and a link farm suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=international+mail+cost+ups PDF link annotation
    • http://ekzo-fruit.ru/11760767731hiezt.pdfIn PDF document text
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/7180433.pdfIn PDF document text
    • https://neminijovasagig.weebly.com/uploads/1/3/4/6/134603544/sijagop-niwonese.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/lufafemize21ppt.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/fusagonu-vopazar-vuxef.pdfIn PDF document text
    • http://vujunebidapa.22web.org/tojugelanipaguvivuxi.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/mazekumolumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5feaf2ff91275.pdfIn PDF document text
    • http://duxogesubuz.22web.org/how_to_do_citation_in_word_2007_for_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fcb09376a240.pdfIn PDF document text
    • http://hugertely.xyz/how_much_starbucks_employees_makexma3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368998/normal_5fc72b918dde3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5fed42256d9e7.pdfIn PDF document text
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/ee9df.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/gageparavepafovo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagonunanu.epizy.com/zawewejukerujujefosuro.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/odia_shayari_video_full_hd.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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5016 bytes
SHA-256: 5708c3d5c2a9c9e3e594ff04cedf2684a02e989ad4f7fb61dab49a3d03bf6930
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 10272 bytes
SHA-256: 92fb27759367fbd5ee4e77d880e6f3c49e97d5ef3515c9315847e0c1ed7c90bc

Open this report in the interactive analyzer, or submit your own file for analysis.