Malicious PDF — malware analysis report

Static analysis result for SHA-256 66028be5aa4d8fe2…

MALICIOUS

PDF

77.6 KB Created: 2021-04-20 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ec54d626afdf334cdf2dce8030fb3a5 SHA-1: 20b9483836ad1666322a934be5f4484588c3b24a SHA-256: 66028be5aa4d8fe2d2b9b8695c14c7d9200b2de98b9455a868b8412ea393f76e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The presence of a 'Phishing.Trojan' ClamAV detection and ML classifier output strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=will+ks2+sats+be+cancelled PDF link annotation
    • http://duwuzoruperiged.scienceontheweb.net/difference_between_behaviourism_and_cognitivism.pdfIn PDF document text
    • http://sowugadawalu.iblogger.org/prince_caspian_summary_chapter_1.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/noncontact_atomic_force_microscopy.pdfIn PDF document text
    • http://suxawid.iblogger.org/filmywap_2016_bollywood_movies_hd.pdfIn PDF document text
    • http://jogebavipe.iblogger.org/50196899086.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/who_wrote_the_quran_and_when_was_it_written.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_4308cb8338324fe582d440b133e8426f.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_24ccf91c6cc84d0ca553d928cb6b5e82.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_91c6b23d08874678af4b8f437b7ec160.pdf?index=trueIn PDF document text
    • https://a91f1da9-0b84-486d-9199-d95c2ecdf19f.filesusr.com/ugd/82421a_f7e31526c6c4453fa550589e06687e3f.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_b8e8f55db4aa406195e4695bbc84178a.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_5ee066d15cef47d2a7479fafd73b9590.pdf?index=trueIn PDF document text
    • http://pavirej.rf.gd/formal_letter_for_job_interview.pdfIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_e3b19ee0991e4404953985b66978b363.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_f669200f5dde4b59a4467b2296b82990.pdf?index=trueIn PDF document text
    • http://muporomeg.rf.gd/mathematical_logic_for_gate.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_361e7ee14a9a436f97cba8b38aa91962.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_0ddee7daef2048d49e818a3d6bb09624.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_ed894ad63f4741f6ad9b351992e78f3e.pdf?index=trueIn PDF document text
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_a1120eedf0d54e2f9f7359595166b262.pdf?index=trueIn PDF document text
    • http://bolozenafo.rf.gd/did_joseph_campbell_invent_star_wars.pdfIn PDF document text
    • http://rixoxufutafugi.rf.gd/36738403995.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_b002fa292fb544d8ac8a85b4674d25d0.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_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5188 bytes
SHA-256: fce9c1ebc61579c396a6a935cdb6bab064932b7b17b5b733c497a706091a4118
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 11236 bytes
SHA-256: b06e703442b71a2f010d2a89c04c19d0df52a37455a222ed6c09d4a279f1d0d5

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