Malicious PDF — malware analysis report

Static analysis result for SHA-256 901953b9ee832690…

MALICIOUS

PDF

88.8 KB Created: 2021-04-20 02:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6938446128e40404b3566f566a5d5937 SHA-1: 6b2c9853a330e54c26261f26d89f0eaad56b331a SHA-256: 901953b9ee832690df3de6425b2deeb21a6d3cc5f97d80ea73d75133f572459d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO link farming or phishing. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and numerous external URLs strongly suggest a malicious campaign, likely involving the distribution of further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=manifesto+of+the+communist+party+citation PDF link annotation
    • https://cdn.sqhk.co/numevaju/bhagmf8/android_sdk_path_android_studio_mac.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/davanidopifemok.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/ghHjgOh/lolli_radio_hits.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/47947433223.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/how_to_answer_text_dependent_questions.pdfIn PDF document text
    • http://vituloza.sportsontheweb.net/programming_abstractions_in_c_roberts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/99957185852.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/wevazaxaditiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/73247197718.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_00e279d550cd4b77a725c17ec5796ac7.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_9c41fa1ca53a456b92c6b3f47888145d.pdf?index=trueIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/5975224859.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/romeo_and_juliet_full_book_translation.pdfIn PDF document text
    • http://feloxokarapuj.rf.gd/rekazitutajutonu.pdfIn PDF document text
    • http://memexojiwa.epizy.com/barangay_election_2020_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/detroit_become_human_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/numowipamalofekage.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 5328 bytes
SHA-256: 4615991e40c4c8228568617074a58de38e841efdfb234ed0d8022a64a01fb272
font_01_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 10840 bytes
SHA-256: bba9f068c8a33463971b2372253fd722103cbc98f1c27014ad5118041d5d8125
font_02_sfnt_off00014122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14122 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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