Malicious PDF — malware analysis report

Static analysis result for SHA-256 1008ced0e5232c71…

MALICIOUS

PDF

94.8 KB Created: 2021-03-27 21:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1233671fa2bc5ea8edb487041ab2e188 SHA-1: 8ecfd5b09b10c043f85a890abd4ddd91a5cd70cf SHA-256: 1008ced0e5232c7183e9ea049ffda60f066527cdf939484a82e58cff4bedf91b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely intended to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://vilenefex.ru/award?keyword=dna+replication+in+prokaryotes+and+eukaryotes+pdf PDF link annotation
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/c9d1d5fef.pdfIn PDF document text
    • http://gebatuvarak.66ghz.com/science_process_skills_worksheets_for_grade_3.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/sat_algebra_word_problems.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/like_water_for_chocolate_book_sparknotes.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/79b31c841a39f.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/5455593.pdfIn PDF document text
    • http://jinitevuwug.iblogger.org/664530196.pdfIn PDF document text
    • https://retotitinikuj.weebly.com/uploads/1/3/4/3/134349113/8920702.pdfIn 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
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_aa117761f23a44f4b31fef84a3e4681a.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_ed46ee9551f042d98452a9ab3c8aafbf.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_c55ce71b8410490eb54314b41e6bed94.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_4a36b6ac7d484e608489d6cfba959251.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d7a6e3-9766-40c6-8f6a-72985932fb68/susowurenofimakezadevo.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_981fca5c8c4641849bc29267285384ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bad4cc1-642f-49f3-a74f-d53036ec4298/31276119797.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_1d0770a8712c43fe885bf4787272f68b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ebc8dc0-47f9-4476-b5c0-205df69ed694/energy_soundbar_review.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_768d7a56364446a9b69ca1058a8af1cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b91bcf2-0226-45dc-b1e6-1d44ef24efd5/how_to_heal_chicken_pox_scars_faster.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 3476 bytes
SHA-256: b41c0f100b3642e92bff1c8d7ad5835dae183edc2af110fce8334c137163fe07
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 5196 bytes
SHA-256: 176fec5afe5e8cc69ddd5ecf8c5fddf7308380452e93f67b30bc2626ba5cd0a4
font_02_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 10452 bytes
SHA-256: 81b79a986583d3e881ae6bc627a2cfcc5ef62c020686df62eeefa0cc5c60abd3
font_03_sfnt_off00015ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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