Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea2c0df6affdf85…

MALICIOUS

PDF

97.1 KB Created: 2021-06-02 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 45c4dfa0fe8fbb9871d535ea3993f570 SHA-1: 8680e6c2113bf04b975acab00e80d7fabf7915b8 SHA-256: 3ea2c0df6affdf85f72edae06685cc6c5d33510a0351040856f0e4ac47c87009
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including ClamAV's Pdf.Phishing.Trojan-d2568dad23a94d95 signature. It functions as a link farm, directing users to numerous external URLs hosted on disposable domains, likely for SEO manipulation or to distribute further malware. The presence of embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://druttle.ru/123?utm_term=angielski+w+t%25C5%2582umaczeniach+3+pdf+chomikuj PDF link annotation
    • https://nowebapimigofok.weebly.com/uploads/1/3/4/3/134338607/1165751.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/2071560.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/04e2f36.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/mazaledikaf.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/1033583.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/13a5e.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/dinetu_saratoki_nuludikidom_kuvijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_6059a4f6c6c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_603432d42fb33.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/labutipolu.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/zulobiluvin-xogirib-fiwop.pdfIn PDF document text
    • https://pudamokanijufe.weebly.com/uploads/1/3/4/5/134524046/7a940db58646.pdfIn PDF document text
    • https://vifejekim.weebly.com/uploads/1/3/5/3/135322606/9930f3b29647ddc.pdfIn PDF document text
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/tomebukovibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd7be27a0362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144479310/weretasifuvu.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/144499020/borini.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415347/how_to_change_clock_display_on_apple_watch_5.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144500166/ejemplos_de_citas_textuales_cortas_para_nios_de_primaria.pdfIn PDF document text
    • http://sujagajo.pbworks.com/f/the_land_of_stories_book_5_chapter_2_summary.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144483525/fitudexejasorulogutedoxe.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/dised.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144455682/sat_math_no_calculator_practice.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12589 5844 bytes
SHA-256: 86b8ff09ae475628c163e61210b3d2eb8f02f046060dcd394b51040e246a6bda
font_01_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 14996 bytes
SHA-256: de406920cba14a606f81a8605cd2fc3b4174d3110d61d8d94a8d179c3549115a
font_02_sfnt_off00016690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16690 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333