Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4678aaecf45338…

MALICIOUS

PDF

78.5 KB Created: 2021-05-06 22:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c0e5a4960b97ac62251175127be42f2e SHA-1: 4ebed1a1f403cc34703da6e4ee6f3bec4ba90ed0 SHA-256: cc4678aaecf45338cd669ceb5620a493f2b2b02aa1575814cbb49317765c7b7a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://maypoin.ru/strik?utm_term=how+much+do+business+lawyers+cost PDF link annotation
    • http://zuluwububoke.22web.org/pavudo.pdfIn PDF document text
    • http://kimugifogetami.medianewsonline.com/child_and_adolescent_development_reviewer.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/sentence_correction_gmat_preparation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/eie4ibB/minecraft_pe_1._16_skyblock_server.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/vixanijibemeja.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/aaoifhd/stack_color_game_download_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_98f59eb9ddea48979d108e24427fdb00.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_8e38b261e5054c2ba658a2ccc2dfc6d3.pdf?index=trueIn PDF document text
    • http://wuzitipajupenok.rf.gd/ethiopian_orthodox_tewahedo_church_mezmur.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_3f1ffb70906e476698b9120fcc3b9b37.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_e9eadfca986c4bb4853bf642c1839460.pdf?index=trueIn PDF document text
    • http://tifalupu.rf.gd/78026873856.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_68618f8999df4bdfb43d5f3e9551db7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/soloflex_assembly_manual.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_97e2a4a0efcd4eafa6d98f2ba87602a3.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_c64f94bf44e14051aafddaaee97407d4.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_6751bba2b7644ccc85d1a36b66f98e6c.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_cb2a1587cc8d4115a65e61687ce2cf2a.pdf?index=trueIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/axis_bank_current_account_net_banking_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/18956453165.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/70449907239.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_e2a6b2aee12141c598663397462abf05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/choke_motorcycle_manual.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_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 5472 bytes
SHA-256: cc29db8e933cb123dac2a36693616897e9d639f052014894ac08aaf1ebc9e08f
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10764 bytes
SHA-256: 276b4c6f4476588a658d79a3cc55b45cc4b3369525b39ba6fa55de14deb79ded

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