Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d41a041085c1e3d…

MALICIOUS

PDF

80.8 KB Created: 2021-03-14 10:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 867104fa51c67fd8d101ff636aba4934 SHA-1: 182b536240b86ac47545acae82a26b0402fdad6d SHA-256: 2d41a041085c1e3db6a15accaac7091389b60dff24d92000dec5d6bf493ee45a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/wb?keyword=usb%20microphone%20circuit%20diagram PDF link annotation
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/3d4d3b879ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fe8f8d16518d.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/tajibamife.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/CfIbjdH/2350101531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_6007b9e0d6eb8.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/1984064.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/c52697441.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/f042f.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/tLyAgjf/percentage_off_calculator_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/Yia1ngd/puxuzoguga.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/dudikot-wasaxaxokijowu-pitemugagil-vupakafuse.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/gevegotelifirobitep.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/61961979470.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/2hjDKhb/tirulimawerazajaxuf.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/215ec6fcd5.pdfIn PDF document text
    • https://tekeginisexufu.weebly.com/uploads/1/3/1/3/131381150/pifidediben.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/Pjjhhlk/bounce_house_with_slide_and_blower.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/fifth_wave_feminism_definition.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/e79acbc2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_a32b2f9d7a434b7b8330601a4fbb6028.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_29eb3262aab14fe49bb6eee0e6fe88f5.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/juz_amma_surahs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 5468 bytes
SHA-256: 3a4bee8f752eb6270abbc7ff4a87a0361b95f403b9aa04b81dbb57bc0ea8193d
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 10868 bytes
SHA-256: f6e5946ece291348cae57194a42e5d6bbd92c605d9b07aaefc64bb7764547f6f
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c