Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97a2d89a8ecbb82…

MALICIOUS

PDF

83.2 KB Created: 2021-02-24 12:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 06cc71823a255c7985e32ad1e2385a98 SHA-1: bc4cc386f16bb8b78a7566a34fff0579d235aef4 SHA-256: e97a2d89a8ecbb82562a6bce7839147e759b82818545c6e1bf94929e2b972dcb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, and contains numerous embedded links to external PDF files. Several of these links point to domains associated with link farms and disposable hosting, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of a link to a known malicious redirector further increases the risk.

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.
  • 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/wix?keyword=speed+machine+worksheet+answer+key In PDF document text
    • https://desujerobum.weebly.com/uploads/1/3/1/0/131070458/vamepubavanog.pdfIn PDF document text
    • http://jabisoj.22web.org/42532616063.pdfIn PDF document text
    • https://gisunada.weebly.com/uploads/1/3/1/4/131409009/957e5741b59b31.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/b3xeH4E/majomabifufevobime.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/9386064.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/fgjlqfG/roller_coaster_games_theme_park_rides.pdfIn PDF document text
    • http://sokuzise.iblogger.org/august_osage_county_play.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/8441886.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/54e24521010b.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/bapasebidodis_fufawidis.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/bx1qwpu/paper_ninja_star_shuriken_origami.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/wusigipufuvowix/47386332140.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/95898554567.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/12313270584.pdfIn PDF document text
    • http://bolumopip.rf.gd/poxuluposika.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 5640 bytes
SHA-256: 38b9ba427dbcb1d516c8a0c496e5097e76a581534b9e0c91ca57d31642c6bda9
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10440 bytes
SHA-256: 2a71e1be8943c286d86d94f5c5f91a80489d25a1e7814267ba7a460092281328
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf

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