Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b1819654aabed8…

MALICIOUS

PDF

102.2 KB Created: 2021-05-08 21:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63467398f00b1cfb36685e4c3252aa3c SHA-1: 2c71bef7b2d0a224e01a69f2f9b0d817c3a24771 SHA-256: 38b1819654aabed8ed0a755332894626f3d05ac7cc62140763ccbba2003f1a0e
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 domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jottigo.ru/strik?utm_term=the+compound+effect+bangla+pdf+file+free+download PDF link annotation
    • http://13millions-warzone.store/99253787949pz60v.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/bimedupe-vapejoguru.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/14ed0.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/vonokozasibo-roxerota-xivogetipirer-guvamamumu.pdfIn PDF document text
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/ff8be3b03ab.pdfIn PDF document text
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/numewakofas.pdfIn PDF document text
    • http://znasila.ru/351578042513y0e1.pdfIn PDF document text
    • http://phulop.store/starting_out_with_java_from_control_structures_through_data_structures_3rd_edition36r1e.pdfIn PDF document text
    • http://abanca-electronica.com/modelo_atomico_de_schrodinger_maqueta_3d9v32k.pdfIn PDF document text
    • http://buytoday.cc/biletololkq9z.pdfIn PDF document text
    • https://vosaxiwajikox.weebly.com/uploads/1/3/0/9/130969878/045ca72707.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/20b24aa5-300d-4232-adc6-3ec33e17a27d/dapes.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_5cc0c8e88dcd4a17b4ccac1f794f3c8b.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_cad9de16548e411b9c7633f3bc349fd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/125eb6bb-3111-4a4f-af64-46da8622dbb9/74089051238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26aa15de-9036-4824-853b-efb99517fe1c/58755476349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8964f4cb-61e6-4c6b-a7a0-e48f54a4d791/69031030027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9de865f-934c-425f-9e62-edad6e68241b/the_battle_plan_for_prayer_bible_study_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f514cc8f-96b1-43e9-86bd-4f647d04df70/can_type_1_diabetes_be_cured_with_diet_and_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37679000-e006-4c62-8341-2acc5a68a5e2/fluke_t5-1000_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bc2969-b20d-4948-a902-98d7642a3a22/22120848935.pdfIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_7fa1cfd0c3854f65a4cd668933567925.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da26b42-5bd4-414f-9aba-736c4651393e/2006_lincoln_navigator_owners_manual.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C11 5572 bytes
SHA-256: 9b10a482333ce841d00c1cb62126dd06decd875cabeaa0410c2cca3ee22b9c27
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 26908 bytes
SHA-256: 8b4558e61a90f0096f3f2b8faab4fbafcdd229b6bcb0fb0412510027ea1905d6
font_02_sfnt_off0001664a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1664A 9980 bytes
SHA-256: 71d190f8e92c65321636c1f15cd5d786007c81bbd9446a24cf0bba4100f1715d

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