Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bea414586b68594…

MALICIOUS

PDF

78.9 KB Created: 2021-06-01 03:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f8c58bd0308ddf94c9b3527f3ec2c21 SHA-1: 79067a444ab8f55a9271dfb330c5094fbd32ba23 SHA-256: 6bea414586b68594435a197572ddca125f9dbcaf8ad7350472e4702374bcf3b5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/pbw?utm_term=que+significa+chala+makuki
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/kefuvela.pdf
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/lubamasixuwof_merol.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_6039ce8e3a8da.pdf
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/1749547.pdf
    • https://cdn-cms.f-static.net/uploads/4467589/normal_6038399982340.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6016a4ee92acb.pdf
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/3943203.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_6032f86324eba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422355/how_to_get_pets_in_giant_simulator_2020.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144435744/guava_family_travel_crib_instructions.pdf
    • https://uploads.strikinglycdn.com/files/1f86af8c-6221-4a08-adc5-a497bdd07784/difizikodabumogodunusano.pdf
    • https://uploads.strikinglycdn.com/files/4f9b3df0-99eb-4cb1-9d0e-fe1f0db7c1c2/sifuvuwibabepesudafetisik.pdf
    • https://uploads.strikinglycdn.com/files/d6f8cd1d-af50-4937-8c0d-beb2807ef6ae/24_hour_weekly_planner_printable.pdf
    • https://uploads.strikinglycdn.com/files/41a09f0a-2605-4ea6-bf84-f47f46b13955/salmonella_aoac_2013.01.pdf
    • https://uploads.strikinglycdn.com/files/31a51016-0c2c-4213-9200-ea8b7682e02d/vevekamep.pdf
    • http://mikabipi.pbworks.com/w/file/fetch/144432558/aunque_me_cueste_la_vida_libro_gratis.pdf
    • http://vatojorisa.pbworks.com/w/file/fetch/144435609/nelavivejubufegatisab.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144417987/17st_6lbs_in_kg.pdf
    • https://uploads.strikinglycdn.com/files/ce05b878-5b89-4c6f-91ce-27475b82c1a2/how_to_file_a_lost_phone_claim_with_verizon.pdf
    • https://uploads.strikinglycdn.com/files/c452e654-b309-4097-b32d-93d45f5754c0/fomawipot.pdf
    • https://uploads.strikinglycdn.com/files/7e84ca1c-883c-42bf-8ec5-766b66ee4504/rajonomakoxu.pdf
    • http://wozixokumo.pbworks.com/f/state_of_survival_gift_codes_discord.pdf
    • http://zigunef.pbworks.com/w/file/fetch/144431613/binomio_al_cuadrado_problemas_resueltos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e595.bin
34699f33b0230cb2475ff67eeca4dc52dfc059bdec6647005e412eb174edf338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 3656 bytes
font_01_sfnt_off0000f295.bin
13d0e70155cbe96281138332a1c01f44b89298f2de59a34342fdc87496c06313		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5324 bytes
font_02_sfnt_off0001049a.bin
1208064190dbfe03873cbd4d7948f027a9484235da67d15229c9bf421bb869e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 12224 bytes

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