Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d30c3de357bc29…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 00:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7a0d0747eb5218d38b2d515d750db254 SHA-1: 49db51e38758cacd951a4da2cbcca93edd04de6c SHA-256: 11d30c3de357bc29dcea584eb89cc369013910988634c16a9e6c27731b0f093e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body text, though partially obfuscated, includes 'Cries pain assessment scale' and metadata indicating it was generated by wkhtmltopdf, which is often used to create SEO-optimized PDFs. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or malware sites.

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://xezojetit.ru/wix?keyword=cries+pain+assessment+scale PDF link annotation
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/dupaguferu.pdfIn PDF document text
    • https://xurigaral.weebly.com/uploads/1/3/0/7/130738792/b6158a8a40d37.pdfIn PDF document text
    • http://flylovel.com/dos_batch_if_examplesn28sa.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/76432334892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_603cb1cc8a4cc.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/3001783.pdfIn PDF document text
    • http://itabody.space/9640388195nbg88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601482e931fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_601ddca1261f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5fed24f5a8d80.pdfIn PDF document text
    • http://toportt.online/naming_esters_worksheetfs0pk.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/502da0cb0e310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_603833eb60408.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofomaseforuz.rf.gd/nu._edu._bd_form_fill_up.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_ff6f4d570d2c404a990c71b23e804938.pdf?index=trueIn PDF document text
    • http://badiwofotafazol.epizy.com/58882428165.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_e89a491ff5c94f74b316c845f08989ed.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_3fd30d0c03e74d4d93c266769ee42402.pdf?index=trueIn PDF document text
    • http://pilevujomeludo.rf.gd/zemefikupigozemiranumux.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/zasakes.pdfIn PDF document text
    • http://xipokawopigigig.epizy.com/xobomutefuliwukepan.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/what_is_the_symbol_for_nasdaq.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/40595233338.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_59a97530e6ba4f28bc773ddaa6d16f7b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/wordpress_client_login_portal_plugin.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_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 4984 bytes
SHA-256: 8731f25051bca1d8377fd37c0d5cb121a043461c5eebc9cc3e5431fc9d8d21d3
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11240 bytes
SHA-256: 6fe7a26d57c79d54c2bbf45026047480153af59c13248eb750d5f645d2153397