Malicious PDF — malware analysis report

Static analysis result for SHA-256 c368f0ba55b298aa…

MALICIOUS

PDF

79.1 KB Created: 2021-06-03 00:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d45f5fe34cae4b7d839e734adf144f36 SHA-1: 7dccc40a9108ab5fbdb98d041f6a8d05338fc640 SHA-256: c368f0ba55b298aafb7ead60b6535377874c4389d4e5d1833e15829b20e5dda3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL leading to a domain associated with SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious or spam-related content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/pbw?utm_term=top+10+selling+adele+songs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413239/normal_602d6bb75ae1a.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/lutotaso_petowimufezibu_kulatugasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffd060a1ae67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_6006aebf13014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fdf128fbc52d.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/nifemumigur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc7e499bfefa.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/farazide_silerapu_wusoxeb.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/9834559.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/9ac29e63a.pdfIn PDF document text
    • https://depuxibuf.weebly.com/uploads/1/3/4/7/134762413/8b79cc.pdfIn PDF document text
    • https://xusukimijep.weebly.com/uploads/1/3/2/6/132681495/balizuramexiwezux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fe89cbddb914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5ffac11498abb.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/gamolebepijoxapova.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/5177769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5fe78735a4132.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/gitexuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_606e78ea0d734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_6059acb8e9ab7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/76bed60f-7898-4f50-ba3f-cfa57711e0f0/formato_de_minuta_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9164953-2f06-4d3c-9400-3f666f8fe18d/lesco_commercial_plus_z-two_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a8816a-a04f-4905-95f7-63d76ff21119/65479019743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385fbac1-430b-4838-bf8b-a1674a4f4b2d/satukodawipatafiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836c678a-49e5-4d79-82d4-995121da4ab3/4th_grade_math_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5f3b97-c9ae-4c2d-b068-54232ce51dba/magic_mouse_2_ios_13.3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 4880 bytes
SHA-256: 0c44a4613f5fdfd6b12b36f9d58e727fda581f2dff5aabf8af6662b7793263ad
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10608 bytes
SHA-256: 8c366976f92d742ca7701f36adfbc049b8cb3322c3cfc5853a65a40b75ace61d
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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