Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1447b68a011d04c…

MALICIOUS

PDF

84.9 KB Created: 2021-03-20 08:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a7b65fe29180ee67abeb90f09cbe9c SHA-1: bcc265e402f7dddd51e1149e6783fefb43deb8e2 SHA-256: a1447b68a011d04ce8be664d1c4955f9ad271e1fc49530c0ddd67e97331b9260
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, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://vilenefex.ru/wix?keyword=maplestory+pre+big+bang+training+guide, is flagged as unknown reputation and is likely the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=maplestory+pre+big+bang+training+guide
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/2966513.pdf
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/1593982.pdf
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/7335189.pdf
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/zupatosid.pdf
    • http://xufuzema.sportsontheweb.net/30015950394.pdf
    • https://sipedevete.weebly.com/uploads/1/3/1/4/131438766/ef60a127e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midipes/lesobikomamazawajilawemo.pdf
    • https://s3.amazonaws.com/sasufufa/53484554077.pdf
    • https://s3.amazonaws.com/xakajoziwibi/69414146950.pdf
    • https://uploads.strikinglycdn.com/files/ec08d78a-8295-4d4a-94fc-4ca858f79248/rafiwirigilojejoles.pdf
    • http://bemuvarewu.onlinewebshop.net/hernia_inguinal_direta.pdf
    • https://s3.amazonaws.com/dorulusof/6718074283.pdf
    • https://uploads.strikinglycdn.com/files/34e4327f-5e7f-49a8-8146-7a54019d86a1/how_to_clean_range_hood_filter_with_ammonia.pdf
    • https://uploads.strikinglycdn.com/files/3d3fc193-1856-4970-a3c7-a4c869681a27/92284181595.pdf
    • https://uploads.strikinglycdn.com/files/a5513117-19d5-4a1b-819d-f4b8bdd05ca0/sq8_mini_dv_camera_1080p_full_hd_manual.pdf
    • https://uploads.strikinglycdn.com/files/cab799e3-149c-4871-be7b-586ea4e672c9/polaroid_is2132_test.pdf
    • https://s3.amazonaws.com/fadadedezeker/keto_diet_plan_indian_non_veg.pdf
    • https://uploads.strikinglycdn.com/files/c1121ab7-8a1b-41d4-a62e-0bb63f12d43c/international_financial_management_jeff_madura_test_bank.pdf
    • https://s3.amazonaws.com/pazatuv/kuzemegobomir.pdf
    • https://s3.amazonaws.com/wipotegadodorek/28448918624.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b80.bin
6550b5712aa3d83e4a5c5ac88347cf96326a9bb660a72505802eb42acc6fc744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 5372 bytes
font_01_sfnt_off00011ddf.bin
93cde4a7bbb261f2564ca001f38880e13577af6fd087d39f26716ae0bcc2249b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 11220 bytes

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