Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb11a15f54e9441…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 16:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88ad3e42eb24e6bb3514ed760f036427 SHA-1: 48a2c058e33ddf66f05e4e84f228302c8c8603f8 SHA-256: 8fb11a15f54e9441db1296e84b07da048eacedc966ffc8eb5ee39b89e64bc503
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely delivered as a spearphishing attachment.

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://druttle.ru/aws?utm_term=how+to+wipe+lg+d415 PDF link annotation
    • https://cdn.sqhk.co/kepilujofeje/l2kTjg5/instagram_downloader_apk_ios.pdfIn PDF document text
    • http://firstsecu-paypal.com/lebejinojaworolakpglq1.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/muburafomur_jalojisoderib_vasetine_wuxujexipikediw.pdfIn PDF document text
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/zibatubu.pdfIn PDF document text
    • https://satataro.weebly.com/uploads/1/3/5/3/135350270/2981069.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/2679324.pdfIn PDF document text
    • https://nawiwunusuwo.weebly.com/uploads/1/3/2/7/132741181/9145916.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jfPjgjc/gazazizizoje.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/ZQDmgg5/mutonekofasasegupop.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/fatexa-ropavaw-sevize-genaz.pdfIn PDF document text
    • http://helpcopyright-service.com/xodamuwaweladuwiparuhhas.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/Yhdgdjc/fogin.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/xetix.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/124882616423a67y.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/fatisake/jupuzabiwivibod.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/narasimha_movie_dialogues_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/lokezobuku.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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 4960 bytes
SHA-256: f46aedf450d39f3c45d19bbb9d5a1633d60fe3bc8d98b8d12048fdec67050df1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 10892 bytes
SHA-256: 8fb41206eccf19e855fe7d4d09c7151668ffab7a968f555310dcec2f4859bf21

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