Malicious PDF — malware analysis report

Static analysis result for SHA-256 c165c1904b79cb7f…

MALICIOUS

PDF

78.4 KB Created: 2021-03-25 09:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 076abc157ec02102c5a973d7abecec6e SHA-1: 04f4d29108b6bc8464044b507e2cafba79073843 SHA-256: c165c1904b79cb7fb04eb6ef377cb06951737c852ee8a29576067710cc09c093
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=actions+worksheet+pdf PDF link annotation
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/2614937.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/4028349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_60156708c426e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_605c18064986a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_600de770995b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455406/normal_6054815d196f4.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/ed61f45fbc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_604500685faf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_5fec33e8b48fb.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/58921528860.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/personality_adjectives_worksheet_esl.pdfIn PDF document text
    • http://ipoteka.net/wizomevotafeplo1y7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_6028740114771.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/addition_and_subtraction_of_dissimilar_fractions.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/sapor.pdfIn PDF document text
    • http://inostrana.com/leguxazepesaxumixi0qkeq.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/mukekew.pdfIn PDF document text
    • https://wulukapuw.weebly.com/uploads/1/3/0/7/130740123/128181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_600fa6ef4d871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fdfb8ad5aa74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fe1fb3b0a402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/microsoft_excel_2020_practice_exercises.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/boy_scout_first_aid_jeopardy_game.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_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 5144 bytes
SHA-256: 0d19aef8b67fc87471d96ac5a8634435d79fe69047cfa95f835bce3c0c9d1bfc
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10356 bytes
SHA-256: 6bca23d6ad5d469e30b0c3ac3fce91f162bdeeada04279e6c9c7437187534774