Malicious PDF — malware analysis report

Static analysis result for SHA-256 c041b1a2e43b44e8…

MALICIOUS

PDF

81.5 KB Created: 2021-05-30 23:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c7535a6d151e517b4c82b63facb8c1cf SHA-1: 96173d47111ff4d6f84689ae88699c1d027815c9 SHA-256: c041b1a2e43b44e8dcb8d763ea4a9cf35c219f9ff88a40f44913ff979ddc2ba4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9957

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://midufefew.ru/123?utm_term=java+minecraft+1.+7+10 PDF link annotation
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/rijivemajejigotufi.pdfIn PDF document text
    • https://gavakemew.weebly.com/uploads/1/3/4/5/134591392/bezidisulipiti_kuvuxajo.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/jipekakupudusowuxaw.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/legidepatarowifor.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/zilono.pdfIn PDF document text
    • https://kobuvenaxoz.weebly.com/uploads/1/3/4/7/134762740/bojukutomem_xusadidopudipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_604161d636004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_605566197ad7b.pdfIn PDF document text
    • https://pupaxutakigi.weebly.com/uploads/1/3/4/5/134579126/5086971.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/viwemem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_6016f24e4a42f.pdfIn PDF document text
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/1f4311c1880f88.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/844a85cc-eec5-4459-80b0-43edde0aa88c/61961139495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe22162-9f8b-4576-ad39-c62dad4cde90/what_is_a_balanced_diet_for_an_athlete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77153b95-7155-4214-8fd0-424526bfb1e3/inseparable_phrasal_verbs_examples_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37589376-ebfd-42c3-b61b-60c1957f2162/how_to_get_into_bios_on_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d1d4bf-bef0-41c9-a880-b5a9be4a29fe/john_michael_talbot_table_of_plenty_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9d16f7-728f-4529-a4c3-589c571ca4a4/13130054978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ad60b4-236b-4d8c-a022-e53955747b40/kodoramiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a261dc05-7981-4e89-9808-e5eef176ad04/john_deere_110_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626552e3-952e-4d6f-a255-9444cce1d31e/home_zone_led_motion_sensor_security_light_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0067e41-48fa-45b6-aafc-9b0b9d174a88/dominos_cheese_burst_pizza_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d94dbe-5559-4f3b-8c29-17c540b6377a/how_to_start_a_review_of_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaa272f-9aec-494f-a518-ff913505a9d1/find_p_value_normal_distribution_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2699436a-877e-4d60-9be5-d1b323ccd549/36001647513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b447b663-a624-4b48-b9a3-0fffb74bd7bf/wumimufivow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0924b13-b33e-4a18-adc7-16b585eebafd/upfront_magazine_answer_key_november_2_2020.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_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 5172 bytes
SHA-256: 96ea79fb8e0681cf986ea948dbb57fd36f0f75eb182fd978bba6f686f7405264
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10852 bytes
SHA-256: 43cdde98e2609effe990bbdfda064a5af1f7729f43f71c8593764b247fa1171d

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