Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cba0580f2003a1c…

MALICIOUS

PDF

72.1 KB Created: 2021-05-04 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c1e4cdc49781800df0e476c1850866c SHA-1: 83791c20e469acbe0587b329f95fb5103ffa2745 SHA-256: 6cba0580f2003a1c4d916915be4787115782b0725536265a54d84507b728431e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/strik?utm_term=watch+twilight+breaking+dawn+part+2+online+free+streaming PDF link annotation
    • https://cdn.sqhk.co/zimopiroxab/Jgehbf8/51224107744.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/1f89db3b60f015.pdfIn PDF document text
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/jefiwomosutuserisos.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/megelatutunuvov.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/jsniehb/14969218280.pdfIn PDF document text
    • https://sopesurikef.weebly.com/uploads/1/3/5/3/135317881/mojer.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/dafewesowukulivad.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/gILeRhg/87611598623.pdfIn PDF document text
    • https://nuzalegexokoz.weebly.com/uploads/1/3/0/8/130814177/cfbb62a428.pdfIn PDF document text
    • https://ritefebeg.weebly.com/uploads/1/3/5/3/135316582/fovasowaxekobabom.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/16770.pdfIn PDF document text
    • http://girlita.space/1st_birthday_invitation_templates_free_greetings_islandn24be.pdfIn PDF document text
    • http://getchambre.xyz/arris_surfboard_sb6121_speed5yorh.pdfIn PDF document text
    • http://azorocheat6.xyz/mathematical_reasoning_questions_and_answers_free_downloadba2ct.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/gfjhjgg/free_walking_dead_wallpapers_for_android.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/8233337.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/vizio_sb4051-c0_soundbar.pdfIn PDF document text
    • http://openchambre.xyz/what_is_conduit_wiring_and_its_typesk38i2.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
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_d61d5358ae59483cb9e99b4598bd48bd.pdf?index=trueIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_c0f54ddbdd7145489091293b4fb18a19.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_43d5f0a37e4741c7b87c695e4e488fa8.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_11ed90648bb74f0bb3c2034b98d9cc6a.pdf?index=trueIn 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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 5796 bytes
SHA-256: 118bfef9f621fb0f1ab6e13cf10820ab6b31e231eee905340aa70a148c2374be
font_01_sfnt_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 10280 bytes
SHA-256: 868f4eca964f2aec746013582861e9bab2589f20ef3f55333450ce852679c707
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3