Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8fc23c2949c400…

MALICIOUS

PDF

88.6 KB Created: 2021-03-26 07:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 88f99141176ef0c137947ef0ba283b0b SHA-1: 1120c533bb3518f32f097d723ffecff90fbfa48a SHA-256: 9b8fc23c2949c400d0eda75dfe9774290ac7c3aedfc8a5fc2113dcc9793d2708
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, a technique often used for SEO manipulation or as a lure. One of the embedded URLs, https://nipisod.ru/123?utm_term=leveling+guide+ro+classic, points to a domain flagged as malicious. The PDF also contains embedded JavaScript, which could be used to further exploit the user or redirect them to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://nipisod.ru/123?utm_term=leveling+guide+ro+classic PDF link annotation
    • http://malespw.xyz/6th_grade_master_spelling_listquxre.pdfIn PDF document text
    • http://betmoy54.com/what_does_comcast_code_s0a00_mean263qa.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/17677300626idio3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb18e1e6-e6fe-48f1-93d4-8cb6aefb61ac/how_to_use_soap_dispenser_on_greenworks_pressure_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e55354a-ae77-448b-80cc-764b223aff47/new_moon_february_2021_time.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_cc265a12828541928eb18600f0d4f359.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/formation_himalaya_svt.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_534685f8fc054187ae5a154bc258f26a.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_df08281c2f1a4421914161e7f5c0ebed.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_9a7e56416e6942ceb53df60020b94de9.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_cb6248086f154b13ae3fb24028904218.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_f56c586c6e0d420589081be81e39469b.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_d1da235934934221a2d3abf68bbb6075.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/bioassay_guided_isolation_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419d55e4-740d-4ef6-a0eb-05d8996baaf7/garmin_gtn_650_xi_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb35032-1aaa-4f25-a0e7-8ac59b6197e3/magic_chef_4.4_cu_ft_mini_refrigerator_with_freezer_mcbr440b2_black.pdfIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_c55a40ff3d9c44b098e7a43af2d36b36.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_5c27c852a0b64d429a976c106babf0f0.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_30032c31cec846d894ad5fa43ca6ac53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/fox_news_chicago_traffic_reporter.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a494a03892014f2aafb3ae7ba0be957d.pdf?index=trueIn PDF document text
    • https://c538924d-9290-4e35-808b-5013ecaac822.filesusr.com/ugd/047ea9_b9cf0bb57ec54e2d90151924a3e685ea.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_9e1699726b9f47eaa13f682a92d3807b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb319fb1-f4f7-4921-b75e-f8caada62ca8/27628484028.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/rumejuvojefuni.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_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 5108 bytes
SHA-256: 7759ee93ce6d4567c32306da7a196f457a4f1d76b08807201b3031fd7ae933d6
font_01_sfnt_off00012dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCC 11488 bytes
SHA-256: ab1bc1349e503e415a8218989310ea452f9b754db547e7e33a1f8efd793c2545

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