Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4730c4d06ca09a…

MALICIOUS

PDF

98.1 KB Created: 2021-05-28 06:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bf447f2a48b376f26f946a677f79e12 SHA-1: c0008aeb733c756570df4e352641f866c575e98b SHA-256: fd4730c4d06ca09a194f27ea46cafc31c7a827ccecdffb7d0f10b9be0c1b63b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with the primary malicious URL being 'https://gimoguvi.ru/123?utm_term=atmega328p+arduino+pinout+pdf'. This suggests the document's purpose is to redirect users to potentially malicious or phishing websites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=atmega328p+arduino+pinout+pdf
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/87697c0cca433.pdf
    • https://gukusabijimesop.weebly.com/uploads/1/3/4/7/134761354/lelepeliwafoka.pdf
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/e77dc4fa2bfa.pdf
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60220f19a2331.pdf
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/66bd73e9772.pdf
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/fasugixekop_zifedemajage_xigexotezit_tonomot.pdf
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/wawegufori-vureginetag-juziva.pdf
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/kisef_vapuzepixaf.pdf
    • https://pomonomiwubexi.weebly.com/uploads/1/3/2/3/132302815/8662821.pdf
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/c290ff7cf809d5.pdf
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6021948778d50.pdf
    • https://vuvonuzomuvi.weebly.com/uploads/1/3/4/5/134508102/9827436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c7e26c4-f210-4f50-8241-37a255394670/how_to_convert_rslogix_500_to_rslogix_5000.pdf
    • https://uploads.strikinglycdn.com/files/686c3381-267b-4777-98e5-34742188687f/jamaica_kincaid_girl.pdf
    • https://uploads.strikinglycdn.com/files/479fe34e-f29f-43ab-9d3a-31d3eba80a63/the_kissing_booth_2_marco_quotes.pdf
    • https://uploads.strikinglycdn.com/files/6d1c4036-5771-4a9f-b67b-79ff54812067/how_do_i_import_a_song_from_itunes_into_garageband.pdf
    • https://uploads.strikinglycdn.com/files/f495d930-6cdc-40d0-85aa-b8468e7df437/xuxepotosarusudepaxidawat.pdf
    • https://uploads.strikinglycdn.com/files/f65c3009-130e-4882-b74d-dce90e6fe447/basic_computer_programming_book.pdf
    • https://uploads.strikinglycdn.com/files/2d0fd0ca-0a6d-4d92-afca-36991321ffa1/13960480670.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141a4.bin
db9fcc3eec1a1375436c17609af9d5b5a457b3945311b50f67fec4acc8935a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 5632 bytes
font_01_sfnt_off000154c0.bin
2f8fdb05ec836d7660a9d0639bf776518429694553b82e35d4f7a89810687720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 11364 bytes

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