Malicious PDF — malware analysis report

Static analysis result for SHA-256 26116534fb22ff6f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-09 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7290308da0ec8aac6a1fc71a4825015 SHA-1: 03bb5c03a1f453914cfbfcc362f32b31e2f883d2 SHA-256: 26116534fb22ff6f08acc2a75643914ae94d113606207d4a784789374367bc44
186 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially unwanted software or phishing sites. The presence of a URL with 'utm_term=fnaf+1+apk+free+download' indicates a lure for free software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://coretry.ru/pbw?utm_term=fnaf+1+apk+free+download
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/vimezavazen.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_606d42ef9e64b.pdf
    • https://vawanateriti.weebly.com/uploads/1/3/0/9/130969814/24b3ab4.pdf
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/2473640.pdf
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/68381.pdf
    • https://feravenokitaj.weebly.com/uploads/1/3/6/0/136095553/vopenukuripinitofe.pdf
    • https://mawebugejememed.weebly.com/uploads/1/3/4/5/134599942/503f5f6.pdf
    • https://nugebivubof.weebly.com/uploads/1/3/4/5/134591316/nogujedidotawe.pdf
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/1077791.pdf
    • https://kunidaput.weebly.com/uploads/1/3/4/7/134766790/6648798.pdf
    • https://cdn-cms.f-static.net/uploads/4493549/normal_60436cdf4ecb1.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_601e6fc599632.pdf
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ffc4ef0934ac.pdf
    • https://cdn-cms.f-static.net/uploads/4470017/normal_60228c3a9e191.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xumefosux.pbworks.com/w/file/fetch/144743955/53293193855.pdf
    • https://uploads.strikinglycdn.com/files/c17c15ff-9c82-4170-9170-cf1e7a15eb14/mavalevidudowewog.pdf
    • https://uploads.strikinglycdn.com/files/eb3d6751-174d-4155-b03d-0da87006a0c3/80813886511.pdf
    • https://uploads.strikinglycdn.com/files/8e01c0e3-3c4d-41b0-9862-bc6451c62993/67099883437.pdf
    • http://foxobekizax.pbworks.com/f/58964870384.pdf
    • https://uploads.strikinglycdn.com/files/c744a222-5ed7-4995-8cb6-a5270a00646d/how_to_write_an_expository_essay.pdf
    • https://uploads.strikinglycdn.com/files/f084aa72-29c1-48fe-82c5-a63b557549bd/vekaxasosukexip.pdf
    • http://gazoridixilu.pbworks.com/w/file/fetch/144528852/amma_appa_kavithai_in_tamil_images_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd81.bin
1feb0a25ef4cefea44e7b0d5218042b90c017b5c843d54e8763a5e946cacf330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 5020 bytes
font_01_sfnt_off0000eec8.bin
c8eb5cf8f1db8d913cc04416108b95fd3e3e5340253515c639b28f058beeb69d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 21372 bytes

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