Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5071f32c96f0e3a…

MALICIOUS

PDF

81.0 KB Created: 2021-04-04 22:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0f8d243f98e43a42d3c573a687b984 SHA-1: 8769e2893aefc81138e6018e5b121f2e5ace1f88 SHA-256: d5071f32c96f0e3ad8e26872d57559859a6d70669feb0306f4ab09115bf15c77
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to benign-looking files, but one key URL, https://golowaki.ru/aws?utm_term=arkansas+driver%2527s+permit+regulations, is flagged as unknown. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though not explicitly detailed, is common in such phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/aws?utm_term=arkansas+driver%2527s+permit+regulations
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fcdfd79a6875.pdf
    • https://cdn-cms.f-static.net/uploads/4473035/normal_6040fe0f5cc57.pdf
    • https://cdn-cms.f-static.net/uploads/4417216/normal_6047db8c40ac0.pdf
    • http://tomokatixo.mygamesonline.org/71055517775.pdf
    • https://static.s123-cdn-static.com/uploads/4459054/normal_6003c713d2272.pdf
    • http://pikufufunuti.scienceontheweb.net/classroom_objects_worksheets_for_first_grade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_3da4ab3dc5b643fc9002a5a137af3bb0.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_de65e874fbfb4a2d9e8ad3f4632dd316.pdf?index=true
    • https://s3.amazonaws.com/pokixovuxik/yahoo_mail_application.pdf
    • https://uploads.strikinglycdn.com/files/bfaed59c-dab8-43ad-9828-2000f3aee506/bradley_smoker_4-rack_digital_electric_smoker_reviews.pdf
    • https://s3.amazonaws.com/polexebuj/what_is_neural_darwinism_theory.pdf
    • https://uploads.strikinglycdn.com/files/63e9ff80-a975-4d13-a050-af94c0d11235/avent_microwave_steam_steriliser_instructions.pdf
    • https://uploads.strikinglycdn.com/files/cbf23ec0-1a62-4a92-a279-dcf0d7e4b59f/bafalilodenatez.pdf
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_08db5ed1a32f4f768575a1278341fc8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23d72431-cbda-4e5c-a111-dfdbc056e524/beautiful_creatures_streaming_sub_indo.pdf
    • http://faxiruvud.myartsonline.com/12815081303.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b0748b03837643e88ee5b8d3039ded7d.pdf?index=true
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_5cc3c2f517324982a4849260bf4d55fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0cf632c8-702d-4be9-8c32-bee51d283cc3/90602214425.pdf
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_46b6633c622842eb86be3c240711a7ef.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_cab0caf429094ef38448193e5c8948b9.pdf?index=true
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_ce67224018354d18813cd8844575e634.pdf?index=true
    • 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_off0000f050.bin
c7a909f8fc041d834aa60a882f8bc27e4e0d45e11020f335381a96b3195e9f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 5308 bytes
font_01_sfnt_off00010253.bin
c55f6ad2edeabc1af8a1982a71cc2a864bf7eb3a3fb3a5a0654ebfe6d034ec5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 11004 bytes
font_02_sfnt_off00012802.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 4324 bytes

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