Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6a50ae964d364…

MALICIOUS

PDF

90.9 KB Created: 2021-03-04 14:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4543f7f7847e888b86339938726dd83 SHA-1: 99a434cc0f778e4a59c31f136fd492f92ea07e6f SHA-256: d1a6a50ae964d3649c269ca40313c26ab0479e6334358372e6e3fe33960d73cb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a high concentration on disposable hosting, suggesting a link farm or SEO poisoning attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nipisod.ru/wix?keyword=solving+polynomial+inequalities+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418973/normal_5ff284acedcd0.pdfIn PDF document text
    • http://kosiwixiwumizu.iblogger.org/jurawet.pdfIn PDF document text
    • http://oneitstore.info/miniature_dachshund_puppies_for_sale_augylqx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_6004e2486af59.pdfIn PDF document text
    • http://vomuniwawan.iblogger.org/8595505618.pdfIn PDF document text
    • http://arendaavto.taxi/cultist_clue_korinthwtvw8.pdfIn PDF document text
    • http://centerbluebadge.com/mugoxuvibank962z.pdfIn PDF document text
    • http://sell-toclick.online/17653375665f3jm2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • http://givimuvupavu.epizy.com/23672658653.pdfIn PDF document text
    • http://mefadagisi.rf.gd/phospholipids_form_bilayer_in_water_because.pdfIn PDF document text
    • http://wipidomi.rf.gd/lol_adc_guide_s9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec60ca73-ca1e-440c-af5b-2bbdd2498c67/do_you_have_to_be_certified_to_teach_lash_extensions.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/80698039193.pdfIn PDF document text
    • http://gudavipupax.rf.gd/72969753186.pdfIn PDF document text
    • http://zonokuje.epizy.com/red_cross_first_aid_certification_card.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/the_gettysburg_address_worksheet_answers_commonlit.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/18836429075.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/nacionalismo_musical_espaol.pdfIn PDF document text
    • http://genosumexeser.epizy.com/mds_3.0_training_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/legazekotipemizuroselene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e150e1-41eb-42cc-a4eb-fa0659321ef4/7610860713.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 6588 bytes
SHA-256: 74cad65dd7c727e66c809a91fb8a6f0a76a9176526c22f60f5209924f5b219f4
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 3332 bytes
SHA-256: 6911cee60c16dc0cc462b520e955feae9a8fed2abba597a0fff7c4eec25cc1ec
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 5664 bytes
SHA-256: c78f6cbc2b25074ffaeeca59e4adb0989a89b5c81e9e829816701538e6a1088b
font_03_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 10964 bytes
SHA-256: 3078a4fb924b8ea338453d4f8ac769b8381a5c6266cb422ccecb7ce5c26f3faa
font_04_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16224 bytes
SHA-256: a3e097a09dece6bfdc97228c52393b72e30af719e214ed5677d91fe75114a77e
font_05_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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