Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d70aa2f3397ee45…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 23:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d25fe68a5418b08a149b99b8519c8057 SHA-1: 671a685d92d055246a855938a9e2a8ac2235dde3 SHA-256: 0d70aa2f3397ee45bf42d08e6e4c80395da2a623742096784b036f0355d47b8b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, forming a link farm, with at least one URL pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=abate+of+florida In PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/gas_turbine_vs_internal_combustion_engine_efficiency.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_603a025432633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60112c913b264.pdfIn PDF document text
    • http://favunewesazut.sportsontheweb.net/94037181538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_60370fea0fbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_60473c7200051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408851/normal_5fdea2a63e549.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/logic_pro_x_score_editor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5fcc725c9a7a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5ff04b9dabe43.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/pejug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/90929839032.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/just_2_words_puzzle_541.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/how_do_i_google_search_with_a_picture.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_f913889411834192a8f2a741a346d922.pdf?index=trueIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/big_fat_notebook_math.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_d323892863ab47b7a75af3a8fa8a547f.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_962777d17e19497599c715443a60f398.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/36633236226.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_1610d179d59b4a8286514b0921a5597a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 4852 bytes
SHA-256: 01d8ba5f4c89cfbf28c77f698049b43368c570aab4df66521b0cde0e3a25daee
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 11668 bytes
SHA-256: a572e34c919e06d47857583ee6ce79feabbc3757b160e23254504741dc200122