Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e953952f19d913…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 18:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 378c1d5e3b84ceacadbdb77741ec8a5f SHA-1: c086943505c76af678044a09b10e686f456b6580 SHA-256: d2e953952f19d913ba10813fd5f9b505d260a681c59c56555ac5e4a5a0e4821c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious destinations. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the link farm behavior indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/123?utm_term=laudate+dominum+sheet+music+free PDF link annotation
    • http://mowukedova.mypressonline.com/bjt_small_signal_analysis.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/4_pics_mystery_2_level_9.pdfIn PDF document text
    • http://iceteas.space/fezivatuvalerubonuk38a8.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/additional_mathematics_form_4_notes.pdfIn PDF document text
    • http://petrol-v-pol-price.site/boolean_expression_simplification_worksheetirw65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_11626cef40d34623b05ec5e0e70d13bc.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_a0853f8a03934bcbbba7ee88fdc684b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/kindergarten_report_card_comments_first_trimester.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_009300b326024c43a212bb5e4dab3197.pdf?index=trueIn PDF document text
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_818ba675672b46be982ce7d84d8690be.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_14bb87432fc7404a8c18b058722f2171.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_c1adab21cdab4ab4955e52be0f84a3f7.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_6b228c5c6c3e45c7a7e3a5b2ed0f59c4.pdf?index=trueIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_0d70a9e6cd464dfeb73d886c6131eafc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/how_much_does_it_cost_to_build_a_prefab_house_uk.pdfIn PDF document text
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_11ce2cd268664c47830085a2e6e973ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/58270673140.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_99c2a18afd264bcc8be5ae34d9a15644.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_b17621412a594526ad6619f1a0951774.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/84365281912.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_16d9d4213c4441818741c1eec5331ae7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 5172 bytes
SHA-256: 6f428892aad934dcbb9dac75212d2be66a704a9e2e8ad6ddb8be5e075c957006
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 12344 bytes
SHA-256: e8983e9a9586a8fb2cb429a1699df03dae1eb5ca2cb1bddfe3ef14b6d76e5351
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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