Malicious PDF — malware analysis report

Static analysis result for SHA-256 910a01cffc91f89a…

MALICIOUS

PDF

82.3 KB Created: 2021-02-21 05:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4aa92494e9d0e64b7b23b1781dbb448 SHA-1: 28d083627fcedcc854fc1217173e9eae73ce184f SHA-256: 910a01cffc91f89a93e04cfc598e668357f2df5626c42b98a3aa4995f32258b8
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/strik?utm_term=read+dork+diaries+online+drama+queen PDF link annotation
    • http://duxogesubuz.22web.org/climate_change_reporter_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/0jihdxE/yandex_browser_with_protect_uptodown.pdfIn PDF document text
    • http://aycotoro0.xyz/sentence_or_fragment_worksheet_grade_34x2tc.pdfIn PDF document text
    • http://sutugolewajoz.22web.org/podanejetunutitozutera.pdfIn PDF document text
    • http://sapofogagesari.iblogger.org/galuwisolibufediku.pdfIn PDF document text
    • http://questotzvezd.space/4_pic_1_word_level_1293xw0ol.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/iajbwvr/68831480338.pdfIn PDF document text
    • http://grinallex.shop/kizixitoxusedidigu1vn10.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/h4Qiav2/infinity_train_hazel_feet.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/587190543076lo1b.pdfIn PDF document text
    • https://cdn.sqhk.co/kukugejekibi/ctfjNge/20161548654.pdfIn PDF document text
    • http://moneymaya.site/sejivabilurorakosabv5gg.pdfIn PDF document text
    • http://itwow.info/batman_the_dark_knight_rises_mod_apko3om3.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/60351784513mn3w6.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/xukanomarexumu/20552437336.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/buponipodifugek.pdfIn PDF document text
    • http://misamoxatupepos.rf.gd/70727970228.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/do_dog_groomers_need_to_be_licensed.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/wudomalov.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 5168 bytes
SHA-256: 99a64acfc028bc88e3cce79cf0c797ad21155cd351713f1e498e2c7ed81de1ba
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 1796 bytes
SHA-256: c9c850e9c351ce199d5e9d1c42a783cd39d33267a74ccb43d8a2fed304f07254
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11248 bytes
SHA-256: f43ef097ff9f7d6777a9a0de0d4305c3ecae8e946c782cb84e8cc567d172ca48
font_03_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16328 bytes
SHA-256: 0ad95216fc52ead1ee8e1b875c7e0507e88213f6ce6a5e96007740e231e172aa

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