Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8ff5010be7ec73…

MALICIOUS

PDF

79.5 KB Created: 2021-03-23 05:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 84471d3745d6765164a0d89e954c33c8 SHA-1: cdeaa8764683dd46ff51d007b256e9064cdfba36 SHA-256: cd8ff5010be7ec738cb93033eb37182d43fd3955554d3e255c617bc558ff6078
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and includes a UTM term suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded links and the nature of the heuristics suggest a link farm or SEO spam attack designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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.
  • 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://resalured.ru/aws?utm_term=how+does+a+brain+process+information PDF link annotation
    • http://clebohets.xyz/vipevasakitoamk.pdfIn PDF document text
    • http://svoylend.xyz/mother_earth_brewing_cali_creamin_ingredientsf0gxs.pdfIn PDF document text
    • http://cartest.pro/t-_shirt_order_form_template_word_freemw5qn.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/functional_analysis_cbt_worksheet.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/advanced_calisthenicsxrt38.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/99373889582.pdfIn PDF document text
    • http://autokenn.com/will_there_ever_be_a_ps58vnto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_8fd3cacef7b64a46ad593b081ec72d3e.pdf?index=trueIn PDF document text
    • https://504b7f7c-d27d-4f2b-a6eb-e8dc7cf660cf.filesusr.com/ugd/6ba015_bfdab110896445e6b573b1f04f245203.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51968f20-1f98-4d20-9471-9dbc368876d2/literacy_and_numeracy_skills_test_sample_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd195b8-970c-4dd7-93b3-afb2b74714ab/what_are_the_five_love_languages_of_apology.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/cuanto_vale_1_pulgada_en_centimetros.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/android_emulator_log_network_traffic.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_b02e91794c064bf6b579e5395463e574.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_1102fc2640564d308c8123bb3c7b6ae2.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/what_does_the_stimulus_check_look_like_on_your_bank_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5f4264-743f-4a17-90f3-f2007fc2bc74/fundamentals_of_physics_by_halliday_resnick_and_walker_10th_edition_solutions.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/reproduksi_bryophyta.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_18c7050e626d4dd08ec0c3b9bad6eff1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/68848594906.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_a8874141316d4e6580d5a88217e2b3a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5318c2dc-59ad-45fc-af93-4f79b3c38cbe/how_to_view_speaker_notes_in_powerpoint_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca93a28a-40bc-4c8e-92eb-7dd222c8c58b/kisoduzinetojuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/51918842092.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_65b837c1f9c64d9197aa3219da4a3081.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_4eec4615dd2042f7a4656a284e217ad6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/4555547357.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_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 5464 bytes
SHA-256: b8260a5ef5c649c61cc4452096badb6d9bba8266406679bda00705dc63de1313
font_01_sfnt_off00010df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10020 bytes
SHA-256: 224e87742598954a085dcbf5b6fc70245fb344555597059d994daac12b98f6a7

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