Malicious PDF — malware analysis report

Static analysis result for SHA-256 6155b45cb92ef744…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f4187169ca2ea42a9bb9f7721c1f305 SHA-1: ba19167e14f4629e78ff3ec97597d184ba4934d9 SHA-256: 6155b45cb92ef7440a1289ef02b0d9055177d7cec91dc0ae9acc4f974192bad8
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=caracteristicas+del+materialismo+historico+pdf PDF link annotation
    • http://lipazegeboludep.sportsontheweb.net/10521124386.pdfIn PDF document text
    • https://gixorinimomavam.weebly.com/uploads/1/3/2/6/132695995/8448868e02f62.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/pawisulitumamufune.pdfIn PDF document text
    • https://pumejikugo.weebly.com/uploads/1/3/0/9/130969330/vomebasudabosi_mugibu.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/scaredy_squirrel_at_the_beach.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/popila.pdfIn PDF document text
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/xodigatit-vomepexeja-nifufexafe-limijogunadeko.pdfIn PDF document text
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/tapipefeg_zibuwaguvo.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/color_personality_test_blue_gold_green_orange.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://uploads.strikinglycdn.com/files/25ec5c82-c306-47ad-a4cd-6191171ebc3d/kodivaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc6c09f-01d3-4ffc-9995-cddf13c4a03c/58616633804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c16d52-d7ba-4551-a51f-2f1657941ebd/wemisizaxirobugujofo.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_d97d2d35494e428ba60c965c7bc1e2e2.pdf?index=trueIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/html_notepad_codes.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_0f168dee2d29468196d186da26b39cc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/908f8fba-ba35-4235-a027-43ccd6238f15/21758534285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2ebd58-393e-4976-b1f3-6b4275135312/captive_prince_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8b0677-1ddc-440c-b8d3-d4af546292b9/46545851446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593f5061-ee7a-474c-94b7-a326567de139/71443420537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6ae0d2-0b56-4d02-86b8-71bf0836efcd/transformation_worksheet_answer_key_algebra_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5100 bytes
SHA-256: 1d508d4efd9bf321e50f0840bde5a2735de651f6bd695742a219ac089c35fbe3
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 12464 bytes
SHA-256: d54dd33971a559c5d58a333e53fa947a5013d40fe3563afa46d3df4ac9d3ef81
font_02_sfnt_off00012b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e