Malicious PDF — malware analysis report

Static analysis result for SHA-256 be833e7a5931a79b…

MALICIOUS

PDF

70.9 KB Created: 2021-03-03 15:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a9ce3ca041bd3ddd7e7d69f3b1b47aa7 SHA-1: 5470b74f537d35ef6dd73f5db583e5f92f94691e SHA-256: be833e7a5931a79b86fc63c773a282aedfbbb8aab032a56c302dd85c75ca43c6
254 Risk Score

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
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=trig+star+problem+3+local+contest+answers In PDF document text
    • https://bebaguromiva.weebly.com/uploads/1/3/0/8/130813696/1058935.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/vijojawi.pdfIn PDF document text
    • https://demimawuna.weebly.com/uploads/1/3/5/3/135389973/babidowajos_tapukimaxifogu_furep.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/lozosalu.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/6951657.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/fatofiraroru_luworo.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/jafojutomif.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/pemafezidokowo-bevejigezuji.pdfIn PDF document text
    • https://bikasiju.weebly.com/uploads/1/3/4/3/134385723/gumizarapibake.pdfIn PDF document text
    • http://kulokozataxat.22web.org/guided_imagery_scripts_audio.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/jafuxu-wimegorepejowip-nawomidudevew.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/8c05737.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/lewuli/biphasic_waveform_upper_extremity_arteries.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/stillborn_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/wogerelepefarewogopovat.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/avantree_ck11_manual.pdfIn PDF document text
    • http://sozejegisiwex.epizy.com/sulor.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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 5596 bytes
SHA-256: e7b0d957448032ee414baaeb9fdaf3bcf70129e3b6e4be38c91fa6c3abb0a049
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10860 bytes
SHA-256: a18920fe93fb21f5ac23f79e7b33dcdefd049a374e2dde3f406e53869487e379

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