Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a4f08b53626334…

MALICIOUS

PDF

64.8 KB Created: 2021-02-17 16:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6dbfc2ff873238dafeaf016c2bab09d2 SHA-1: d9a0be6b854e290fc96a62e81453f9f21f31053e SHA-256: a1a4f08b536263340d6f3afcf666c44577da8a166608852bdaf9c4b313f9b628
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 pointing to disposable hosting services, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript to facilitate redirection.

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://maypoin.ru/aws?utm_term=dnd+5e+custom+character+sheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fd7cca675799.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/sofil.pdfIn PDF document text
    • http://apple-fruit.space/hemostasia_y_cascada_de_coagulacionrwnzl.pdfIn PDF document text
    • http://babysampler.com/15954359832qvxfl.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/996b02f.pdfIn PDF document text
    • https://kepijifawobi.weebly.com/uploads/1/3/5/3/135388201/bujiget_volixamorap.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/1693248.pdfIn PDF document text
    • https://pogeruriwijo.weebly.com/uploads/1/3/4/3/134340707/darateze.pdfIn PDF document text
    • http://extraterrestrials.space/baseball_team_uniforms_mlb8v2n2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fd2bfe4df120.pdfIn PDF document text
    • http://torchqbfl.fun/whatsapp_wallpaper_hd_download_good_morningwzi15.pdfIn PDF document text
    • http://firstsecu-paypal.com/lutabasamocm4nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_601c700e593d0.pdfIn PDF document text
    • http://paganel.world/53785391803jfdwm.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/ca2cd033f98.pdfIn PDF document text
    • https://vimudizod.weebly.com/uploads/1/3/4/6/134632239/leserevosudixe.pdfIn PDF document text
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/wutukemizemexod_nijapewazumelo_nonobolid_pefedufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_6016f0b60e0a8.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/gefaxuv-pubabol-pofawen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA1 5488 bytes
SHA-256: 10f9f1d3c7b8cb8523722ac98c90c8da5661197762149d84c515d28dfa914eb8
font_01_sfnt_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 10620 bytes
SHA-256: 50aeaa532321f234b555924ab92b2b14122219eb700915217987b65d6f035ad2

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