Malicious PDF — malware analysis report

Static analysis result for SHA-256 414b6adc7d87196d…

MALICIOUS

PDF

88.7 KB Created: 2021-02-10 08:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8467a966401f0aa9168a26e2a6963753 SHA-1: 6d2586686b082b2ead53bbfba6414ca0e784d608 SHA-256: 414b6adc7d87196d2beeb34d6841b0510a25e6d101f3656c17de094bc6ecc9da
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'acellus answers personal finance' and 'wkhtmltopdf', suggesting a lure for financial information or a tool used in the creation of malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=acellus+answers+personal+finance In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5fe01611aabf9.pdfIn PDF document text
    • http://hihikane.space/captain_underpants_moviecogro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615b2ce97f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_60043ce057403.pdfIn PDF document text
    • http://believes.space/jarojidofurulevel3jec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_6001fbbe20fde.pdfIn PDF document text
    • http://lolkek.xyz/771100352139lfa7.pdfIn PDF document text
    • http://mmmuuuue.space/tiktok_mashup_clean_october_2020xgcbe.pdfIn PDF document text
    • http://vatosake.iblogger.org/88728303052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6019cc02b9cc5.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/vezumobigodub/pc_video_recorder_free_filehippo.pdfIn PDF document text
    • http://magakawigola.epizy.com/infogreffe_formalits_cession_de_parts_sociales.pdfIn PDF document text
    • http://komadolosa.rf.gd/ercp_for_gallstone_pancreatitis.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/90569886874.pdfIn PDF document text
    • http://dodujorumapide.epizy.com/bangkok_tour_guide_pru.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gajanavekupalumujero.pdfIn PDF document text
    • http://nexuxawire.epizy.com/gobovi.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_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 5092 bytes
SHA-256: 2bc521494be104e45bd4b9e96116222493bd51fbabd1b93504cedf7a91c48f28
font_01_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 13292 bytes
SHA-256: e3d088ecc67ecf46287fb64a43255906d6dd7b1c513f47187fc0c8e4a7fdb96b

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