Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4783b5e9d3141c7…

MALICIOUS

PDF

73.3 KB Created: 2021-02-26 23:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: baad071c666516a162f0acd42879e88e SHA-1: 7191f663dec06e5329350d7f442a5c7c474f8618 SHA-256: b4783b5e9d3141c7254cd4c3341965b7e757df14d7c46e5b4ee6babb513087bf
156 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one specifically pointing to a URL that appears to be a phishing or malware distribution site. The document's content, though obfuscated, suggests a lure related to software installation, likely to trick users into visiting the malicious URL. The presence of numerous external links also indicates a potential link farm for SEO manipulation or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/strik?utm_term=serial+de+instalacion+windows+8+pro PDF link annotation
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/rakulefuvolawufefu.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/49c05d88e.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/juzirelanelotuf_betajabe_fonokolapugi_kupafapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380890/normal_5fc87ddfb52f0.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/hgjeAib/bebazipulapapagoti.pdfIn PDF document text
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/tizukaworepozexeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5ff4a30431f0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5ff7e8312c65a.pdfIn PDF document text
    • https://kowuzuworos.weebly.com/uploads/1/3/2/6/132682574/menokibu-kokurajonurex.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/bavorobagik.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/21je9BU/59541732611.pdfIn PDF document text
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/7586796.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/FdxSKgi/38674183331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5fe295c393f1a.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/supup-dijek.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/7147607.pdfIn PDF document text
    • https://cdn.sqhk.co/rubalibuzodi/VgezLib/brief_history_of_japan_book.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/nilako.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/ihgNjh3/89101128136.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/guxosa/biology_o_level_summary_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/32161613046.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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 5456 bytes
SHA-256: 5ac20092d1e19a694f6625766c5a169f0302bfa166e155af1f1035ea7f102a8f
font_01_sfnt_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 10696 bytes
SHA-256: f4b2a9d51a2ed16bd23a07be020a3f916f19679d05e7e56b2421dec44a112076

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