Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67ea4ba45d06fa4…

MALICIOUS

PDF

76.6 KB Created: 2021-04-30 00:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66b8dcd8cd45e42fb7028c8dc6855d3e SHA-1: 2054aaabce770f9fea20492f527a1a8ba751aa42 SHA-256: c67ea4ba45d06fa47b45b6d19cfd5bb0b52b74fb040b5628bb18af94dcc53024
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. ClamAV and ML heuristics confirm the malicious nature, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=karl+marx+manifesto+do+partido+comunista+resumo PDF link annotation
    • http://mixojixirofaj.iblogger.org/vamolikukinejofikenodixa.pdfIn PDF document text
    • http://zufufamaz.66ghz.com/letapobijakovazazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_6001d771c105d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fec9f222d64d.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_60590953860b5.pdfIn PDF document text
    • https://foguzutaporoma.weebly.com/uploads/1/3/5/3/135322660/3933791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6013e1e8b9d42.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/when_was_the_fall_of_reach.pdfIn PDF document text
    • http://pakimudemezir.iblogger.org/aspiracion_de_secreciones_tecnica_abierta_y_cerrada.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/nusikowenojawerefixasus.pdfIn PDF document text
    • https://japatuxivavagax.weebly.com/uploads/1/3/0/7/130775167/7566528.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/38777167478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6c780dff741240e58a9cac5ad8f6ba40.pdf?index=trueIn PDF document text
    • http://xaxigodugekesiw.epizy.com/une_evidence_agnes_martin_lugand_gratuit.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_d559dbe07a7d439495b890e960cb4bd9.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_180a466a8e4d4a769250e0d6098ccce7.pdf?index=trueIn PDF document text
    • http://tutunod.epizy.com/dezobemolasasalubosofi.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_10124219834d4bb4837dbe8ac77decc6.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_b105152351cf44e59c5bc85648090dec.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_b83575aabe2240e09866431682520563.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 5340 bytes
SHA-256: 8fc53b0e6bbe4d8de09bd06ea91c0190bf9c30aa42c7f32487c75fe8d4bf4586
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 12348 bytes
SHA-256: 37b17fe4d7e300707e2a32c47e93bf72915098269bf501396a3373d27be6bad4