Malicious PDF — malware analysis report

Static analysis result for SHA-256 5636d3e7f5d60378…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 04:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 039ed69f798bf21a807e537b22160dfb SHA-1: 7e19251ae8b5855cdd8a450503064631813f59d2 SHA-256: 5636d3e7f5d603784148bc2787bc1de4aa4cad4e7b435b3675df4395b2a61a62
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a lure to download further malicious content. The presence of embedded JavaScript, although not fully detailed, points towards an attempt to execute malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=english+business+letters+pdf+download PDF link annotation
    • http://nopezimugabotik.mygamesonline.org/encyclopedia_dictionary_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/felodunom/su5jChh/liverpool_fc_remaining_fixtures_for_this_season.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/36160742318.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/ZwMhgNv/gambero_rosso_restaurants_florence.pdfIn PDF document text
    • https://goguzosuv.weebly.com/uploads/1/3/5/3/135343726/676a286e8.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/jchfgdr/disable_digital_wellbeing_samsung_s20.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/how_long_do_you_cook_a_turkey_in_the_big_easy_oil-less_fryer.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/kurixe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_33014fc949124f0ea46b80e9b942c3ef.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/how_to_clean_jenn_air_range_hood_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d0c33b-1b6c-4e02-86d6-8f67fdfeeada/vegetarian_keto_diet_for_fast_weight_loss.pdfIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_56951e06efbb4a0fa9756f4fe3f3c930.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_a266bd67109a4815998561125b163c54.pdf?index=trueIn PDF document text
    • http://tofujuwo.onlinewebshop.net/peningkatan_kualitas_sumber_daya_manusia.pdfIn PDF document text
    • http://gevejonitu.onlinewebshop.net/the_lightning_thief_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1ff1c2-f062-4adc-a3b9-461cf76c86fe/how_many_calories_in_boston_market_sweet_potato_casserole.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_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 5492 bytes
SHA-256: 73ffc6c015f5fc3d208383ad9dc29c55b7937cfe76f9a2c93c82f61d6e6b4ce6
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 11132 bytes
SHA-256: da47834c099ab217b460d7584e6bb85e4fb8f4a0111afe22ba7a33d0ccd737a3

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