Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ab91776907bd31…

MALICIOUS

PDF

138.9 KB Created: 2021-03-23 06:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ba414701cf99cb054069733f667f6f82 SHA-1: 5f6937ada71f488833490ccdd753a2504ffd6d02 SHA-256: 48ab91776907bd312a2e741cd0bf66624425b1ef131906cebe9c4f941e6a9e0b
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, suggesting a link farm or SEO spam operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=libro+el+aura+pdf PDF link annotation
    • http://mrshadow.net/kewerovetizipidel7folu.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/829058109.pdfIn PDF document text
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/ledasipitexikira.pdfIn PDF document text
    • http://com-signto2.xyz/193674280982qjup.pdfIn PDF document text
    • http://jadivaza.iblogger.org/zebuluxofenelerugukovan.pdfIn PDF document text
    • https://ziganuridu.weebly.com/uploads/1/3/0/8/130815115/nefujux-xeroseb.pdfIn PDF document text
    • http://mybiol.site/mitel_5312_ip_phone_setuprprm0.pdfIn PDF document text
    • http://blue-tick-central.com/legadowinepitezokixishoob.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/1790018.pdfIn PDF document text
    • https://fogisitulen.weebly.com/uploads/1/3/0/7/130775537/65a7a8.pdfIn PDF document text
    • https://lonupuvajofova.weebly.com/uploads/1/3/4/3/134341927/89b96af5133b3cf.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/080ecab35fa795.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/dWMJ1MJ/palodagotitafarofopuwugu.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/2935470.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/josilafawumum-rokuwisovupava.pdfIn PDF document text
    • http://antonioit.space/57380082995usmcf.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/ahgZ6hd/how_do_you_block_international_calls_on_verizon.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/nijosupugapisow-xaresibemogegu-xowifudajejamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivifizurata.epizy.com/cbi_shankar_kannada_movie_video_songs.pdfIn PDF document text
    • http://jurezep.epizy.com/wowajifigapegobu.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/dawewexawetek.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_off0001e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E367 4936 bytes
SHA-256: bcacf97d1e00827d595b63b600b065212c8ebce719667c0f58ed4cbc01130d59
font_01_sfnt_off0001f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F43D 12752 bytes
SHA-256: 8963cfc8e8111272235ad3c0e3ef64b5c8c30f46980a05c6775b5c7c1f25b62c

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