Malicious PDF — malware analysis report

Static analysis result for SHA-256 57366b52c5252d52…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 01:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4281aee701814cf2588dde4114932ef3 SHA-1: 2ccc9d45e7d41ab635b99d5b47d45cc3207948fd SHA-256: 57366b52c5252d52e5eab1ef1246bdafaa68c7fccb5d18ec31cb038af8123c7b
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, several of which are hosted on S3 buckets. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious links and the link farm behavior indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=mount+vernon+iowa+high+school+calendar In PDF document text
    • http://vikutoxe.iblogger.org/kubunepezovunu.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/Egfjaic/amc_theater_mobile_alabama.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/0lSjdie/86164420230.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/soraxivufuki.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/hoMniiL/cartoon_video_editing_app_for_pc.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/boxuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xokebore/8281015251.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/jupabasuwubakewagax.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/42712697113.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/bujoverafiduvipodesureti.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_5ce6e4c48bd74b56a378e77bcc876d42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/affidavit_of_support_form_i-_864_example.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/coronary_artery_disease_medication_guidelines.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_eac5973d6d974c6e8276c9347cdf6c84.pdf?index=trueIn PDF document text
    • http://pamanivu.epizy.com/72419008473.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_0bf63253fcec4163ab76f77d0dfcce64.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5360 bytes
SHA-256: a961babd877695f49a570f56b4871df17ca8bcbee6b949f6dc9fe01dfdef4c78
font_01_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 11888 bytes
SHA-256: 8b78d3c1c5a2efb2517e005dc74d5c529250ddf5a8be9801c1249be38ebaa675

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