Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff67fe820d0278c5…

MALICIOUS

PDF

82.6 KB Created: 2021-04-04 00:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ab15e97facb92f15bc4a3c412620845b SHA-1: 6b74c8a89de189693bdc11bf38e759bd39e9c97b SHA-256: ff67fe820d0278c54f5bd2946255edb5fc84e09e69393fb34dda6eac911f3070
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM indicates an attempt to obscure or distribute malicious content through a large number of low-reputation links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://druttle.ru/award?keyword=let+it+go+chords+piano+pdf PDF link annotation
    • http://kulinar2020.site/how_to_change_battery_in_kidde_nighthawkv71ia.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/bhagavad_gita_jack_hawley.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/non_chordates_book.pdfIn PDF document text
    • http://tiserud.22web.org/avelina_lesper_libros.pdfIn PDF document text
    • http://pixxel.life/lusadovotofogagediga1sp4h.pdfIn PDF document text
    • http://malolufixanovas.sportsontheweb.net/consonant_blends_exercises.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/vewepabugezidapu.pdfIn PDF document text
    • http://nufudoze.getenjoyment.net/fistula_perianal_adalah.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/cribbage_scoring_chart.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/evaluacion_del_aprendizaje_definicion.pdfIn PDF document text
    • http://sarhello.online/1810879572zuwtj.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/golf_buddy_voice_x9x8w6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fewetero.epizy.com/91169105759.pdfIn PDF document text
    • http://tagutibebik.rf.gd/jinatoxumolipetowuvudofo.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_530a0c04d52341dd94037b50db2d54a0.pdf?index=trueIn PDF document text
    • http://danebusuji.onlinewebshop.net/95007710788.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/gufoboxarimuturuwaku.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_cdca9bcd1f2247d78491384b2555cebb.pdf?index=trueIn PDF document text
    • http://xidixisugatifes.epizy.com/area_and_perimeter_of_irregular_shapes_worksheet_grade_3.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_ba4f216adccf4f598844052c4f60752c.pdf?index=trueIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/do_any_rivers_in_the_us_flow_north.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_7a92f8bb21c54feab63bc82e8b71d0e7.pdf?index=trueIn PDF document text
    • http://xepadegi.epizy.com/28424074813.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_2ba84f777cdf4df0a861b9c8a15939e0.pdf?index=trueIn PDF document text
    • http://xomexopiguv.rf.gd/wuvavazikexugitezoropawi.pdfIn PDF document text
    • http://rexenejo.epizy.com/pathophysiology_of_bowel_obstruction.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_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 5324 bytes
SHA-256: 3f331857843c33a415e0816edcaea1b416121053f9dee39f4d70220d2fcf6360
font_01_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10928 bytes
SHA-256: 34252ceff7ed649b2356dd11c3911ae94bc9d74f014c8eec2a837102a287c966

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