Malicious PDF — malware analysis report

Static analysis result for SHA-256 813dda74a807f3be…

MALICIOUS

PDF

78.0 KB Created: 2021-02-28 22:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 548d3545b839d38b81cfa896158da281 SHA-1: b1bc6d1001cc9aec8201985aafdbbd7026ae1132 SHA-256: 813dda74a807f3bec367f30188203c710e08bdb6d6fcfbf15b3227600befe8c9
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which are disposable. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

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://crophysi.ru/award?keyword=cub+cadet+ltx+1050+transmission+fluid+change In PDF document text
    • https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/5587682.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/Rhe9hhg/shamans_pop_bubble_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/aAotSha/georgia_h._e._r._o_homebuyer_program.pdfIn PDF document text
    • https://wonumajogo.weebly.com/uploads/1/3/1/3/131379434/zonebuzokexira.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/xxDNhcc/easy_smartphone_for_seniors_t_mobile.pdfIn PDF document text
    • http://pejofewetoz.22web.org/arcaea_apk_mod_1._9._3.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/fakuvezaza.pdfIn PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/foxav.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/4936242.pdfIn PDF document text
    • https://vifoluliguj.weebly.com/uploads/1/3/1/4/131437350/gejejegopisuguzabin.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/audiocodes_mp-114_manual.pdfIn PDF document text
    • https://dijujuvosidig.weebly.com/uploads/1/3/0/8/130873718/lefinitegowifir_wibapuziziradu_zodewote.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/24884185443.pdfIn PDF document text
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/4fc3788e.pdfIn PDF document text
    • https://tenimuleletef.weebly.com/uploads/1/3/4/3/134343202/zogamepeja.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/dell_optiplex_9010_cpu_i7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubazemaxem.epizy.com/7868277656.pdfIn PDF document text
    • http://fixuwebevu.epizy.com/37082045795.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/what_is_the_lifespan_of_a_nuclear_power_plant.pdfIn PDF document text
    • http://juxudawalugevop.epizy.com/42321895142.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5868 bytes
SHA-256: ea8b705da777a98178c8a5110220729d9ab948774dfda7b5b5c48f454e19cfa9
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 10164 bytes
SHA-256: 49467bf0aa005830b283ba9d7e0bfec89205b5f134c094a5f8abff72af08e933

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