Malicious PDF — malware analysis report

Static analysis result for SHA-256 5447cc1053755248…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 11:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f7007082240821c81fbb912f142bda0a SHA-1: 24f9244205aaac431ae201f40a28b92d08b180b9 SHA-256: 5447cc1053755248247173e93723be8322f26c89b8a81ec3ff91cf0d15b12158
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic. No scripts were extracted, but the nature of the links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=zero+first+second+and+third+conditional+worksheet+pdf PDF link annotation
    • http://kdghy.online/kemekolg6ri.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/1637463.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/9a27316f131c8.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/motawikebopuvadag.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/spatial_econometrics_methods_and_models_anselin.pdfIn PDF document text
    • http://cocobuka3.xyz/sazesetawesasafezumipep5drnd.pdfIn PDF document text
    • http://netewe9.xyz/48338566609uo9w4.pdfIn PDF document text
    • http://chelamela.org/wabibej4ehbs.pdfIn PDF document text
    • http://amsidisi.xyz/padorapiod80v.pdfIn PDF document text
    • https://dewokiwo.weebly.com/uploads/1/3/6/0/136028273/d37999c.pdfIn PDF document text
    • http://proita.space/83564898978v6klk.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/ditilato.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/fubafatetosonow_rewokusuza_dizutig_forazovo.pdfIn PDF document text
    • http://productwood.ru/bamufakhgwjs.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/guvapenerivebokuton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_7ef83eee294e438c8a90fd83637dfc8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda4aa89-773b-4393-954e-a292142e8b34/mijimadini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1919d21b-6be2-4316-a3ac-c64938094079/famigumepabadig.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_930e2d4639a649f7953714e76d8f0d87.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_33c1978c74be4cbabc6e9cfc428aa421.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ec6bdc-6c4a-4d43-b7fb-0d5fdfb8c3a3/double_down_sandwich_nutrition.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_97b1e5e565674b569d07afa1f1bc0350.pdf?index=trueIn PDF document text
    • http://wififeju.atwebpages.com/step_up_autotransformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c53428f-da2a-477c-abce-5524f62876c2/can_i_play_ff7_remake_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b1051f-c74e-4a5f-81b5-08d0a4615834/kasifazokodu.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_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5356 bytes
SHA-256: 33967da6399ca179155dc6a86042c855195687dea372fd410a488d50dc04b7db
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 11228 bytes
SHA-256: 832fee9de7f0940ac0658653ced39fb3c19e27b89d5cbe28a39eb6ba698c34bd