Malicious PDF — malware analysis report

Static analysis result for SHA-256 507746d0d5526223…

MALICIOUS

PDF

78.7 KB Created: 2021-03-17 17:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b002a492b57c9ef40e6014aa80eefc2b SHA-1: aeb1dac25a69e994e87144c76d3c712bec400a5a SHA-256: 507746d0d552622342ce3f4c7306a17cf3fc1f3a64a4d8b7939103ee6a9214fb
184 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=subtraction+without+regrouping+worksheets+for+grade+1+pdf'. This indicates the document's primary purpose is to lure users to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=subtraction+without+regrouping+worksheets+for+grade+1+pdf In PDF document text
    • https://cdn.sqhk.co/tajalawad/ig0hhEF/citra_android_emulator.pdfIn PDF document text
    • http://vemazewikale.22web.org/zorafodar.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/39918884044.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/tawupugo.pdfIn PDF document text
    • http://kulokozataxat.22web.org/29732759414.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/hoFG0jg/48278602537.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/shimano_ultegra_di2_r8050_gs_vs_shimano_ultegra_r8000_sgs.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/zojumozujiwukuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/jgZhajn/energuide_fuel_consumption_guide_2015.pdfIn PDF document text
    • http://venusiwaraf.iblogger.org/how_to_make_easy_mob_grinder.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/igsDgft/88911650221.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/PjeHgeA/34715427567.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://uploads.strikinglycdn.com/files/ccf8a31d-a950-4ef5-8a55-8ed2958bc00d/12474593157.pdfIn PDF document text
    • http://gofemotomikuroj.epizy.com/46754498328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b987f663-a764-4980-bc0d-5b00b09d5edb/vimagedupurolu.pdfIn PDF document text
    • http://fubobowom.rf.gd/attack_on_titan_season_3_ending_1_lyrics.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/xudexadewe.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_31c3eea0f1e043479d279b26d41c5bc4.pdf?index=trueIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_ba6f2e51e9124707b1c281654f9a037d.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_26da5cc3ef26453e8da43ae5985dfec6.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_5dfb2d97a6c64557ae5928f9c5a7f2fb.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_42034785c6ad4cc780de6206d493f5ea.pdf?index=trueIn PDF document text
    • http://tofezaniv.rf.gd/3419068883.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/wigurusupojivosuraxemijog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7468d55-44b4-43cd-a3b5-d587d9d604a5/craftsman_yt_3000_mulching_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd575e1-6e1d-4775-b2f4-3e296b7eadc4/2008_john_deere_gator_hpx_4x4.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 5720 bytes
SHA-256: edd2957dddcdd6fb103337385ac1a934344a8ad2bcba528c9854ad401bcec7d0
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 10816 bytes
SHA-256: 0180e6f331a3b4c571fd18595583345d36b4ae31c31110800612e92fe3011c06
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.