Malicious PDF — malware analysis report

Static analysis result for SHA-256 508eee9120345e14…

MALICIOUS

PDF

80.9 KB Created: 2021-05-17 19:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cc723d531262c751b061c613af15e5ad SHA-1: cefba5630a31a0c27330b83741b0cca9d4e9b97d SHA-256: 508eee9120345e14651a946f2344f7416a59dde927a86327d4c8892370e7f5b4
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, http://shortsomfj.space/bapuwagotua6xi7.pdf, is a strong indicator of malicious intent, likely serving as a redirector or payload host. The document body, though heavily obfuscated, appears to contain a search query, further supporting the lure-based attack pattern.

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://druttle.ru/strik?utm_term=how+do+you+change+the+time+on+an+acurite+indoor+outdoor+thermometer PDF link annotation
    • http://shortsomfj.space/bapuwagotua6xi7.pdfIn PDF document text
    • http://getchambre.xyz/beginner_english_conversation_worksheetsjn3fg.pdfIn PDF document text
    • http://hightrade.club/the_complete_glycemic_index_gi_food_guide1xxj5.pdfIn PDF document text
    • http://acupofjacob.com/35760687074e2ldp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffc35b5-d985-4b43-99eb-3fb76579ff06/ninanawabukaxo.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/california_king_fitted_sheet_size_in_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac9bb22-e257-4e73-b3ff-b3c88e0fc8a1/c_interview_questions_for_3_years_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/atypical_child_development.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/scream_3_imdb_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77153e7a-19d1-48d2-9d33-d2571f8048d4/the_magic_barrel_character_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/wazesobowemof.pdfIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_dfa14fe55fb94612b42840ba418aeccf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20575d09-3d2a-46db-ae02-8cb21e1cb6ca/lenuxamivegizinabilelox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08afdd3b-0339-4d41-a167-24d6a69e5d08/alcatel_3v_metro_specs.pdfIn PDF document text
    • http://naluledodosetu.rf.gd/kitchenaid_superba_oven_cleaning.pdfIn PDF document text
    • http://zilosazalepuzu.epizy.com/autodwg_to_dwg_converter_full_download.pdfIn PDF document text
    • http://vibuzegemasi.epizy.com/ccna_switching_router_alley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77b1a9d-cae3-4c52-bc5b-727f23c9c07c/39679097392.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/where_can_i_donate_soft_toys_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7652f1b-8c9a-45f0-8267-c7a1346cc719/aswb_clinical_practice_exam_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2188b83a-f061-40da-bbf7-03b46b5f06ec/56082041965.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/jin_jiang_international_holdings_annual_report.pdfIn PDF document text
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_10ecff1fce8945a99296f581b386741a.pdf?index=trueIn PDF document text
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_a62a0a66830c4c5a815eb4758ae901f2.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f38fe70caa784f9c82cc2bad26e4d62b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7758cfad-0d3f-47c8-b385-c9b91958bb60/xujisijakarokametoju.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_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 5296 bytes
SHA-256: a99ba52a3d42592bcd983c17cc9019b90ffe720d3a89141fe36dc7739f540843
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 10720 bytes
SHA-256: cd9deaea86266d29bc7cd0f7a4c2e2fd8e4485650b123bb1eb2414915d1d217b

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