Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f0f2514ba6fcd4…

MALICIOUS

PDF

86.8 KB Created: 2021-04-26 06:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd6d2a9523bc35d38217560d4e786ded SHA-1: 2ac7995e8dc412b64b436ab38e4b84382383be4a SHA-256: 82f0f2514ba6fcd41f3ba0fc9640d98b80b9ff8432bfd794a243c3ca801a8137
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=troy+bilt+5550+watt+10+hp+generator+carburetor PDF link annotation
    • http://kefudepoduwudi.sportsontheweb.net/career_path_finder_after_12th.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/3209797.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/48799790408.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jjxtidK/train_times_newcastle_to_sydney_saturday.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/9050467.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/89833311694.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/annie_leibovitz_biography.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/wenewupejuligatupiti.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/idneiaS/cars_2_movie_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Ixjdfhh/helicopter_for_sale_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/gvgfOPv/exploring_science_9a_quick_quiz_answers.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/gcf_worksheets_with_answers.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://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_ed570bc0901a46b1b9acb7a915c6415d.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_bdfcc15e25d846bda2e393433d28b46c.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_b40332eb7cae4a8189f5110b1166573a.pdf?index=trueIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_ef41adcbcb7d4ff7a228e5b7abb9beb3.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_fb7d4b46a239437281c2cbcc3178c0f9.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_9550015438304f249cd017af7b066e47.pdf?index=trueIn PDF document text
    • http://nerezusilanake.atwebpages.com/attracting_perfect_customers.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_5d8b010001584d6c82813cab9d0ea25a.pdf?index=trueIn PDF document text
    • http://sakogabutal.onlinewebshop.net/13784683859.pdfIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_7e83f733e49748eb9e9392fec77be48d.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 5500 bytes
SHA-256: 1a11dc9484d7f31d52c53259efec631bbb07bc16005248db4f64a30ec7ed9e99
font_01_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 12364 bytes
SHA-256: a52f072c755aed0e3a8413b955b910fa4182ae1391e39f7a249c303f0e83b9a1
font_02_sfnt_off00013ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c