Malicious PDF — malware analysis report

Static analysis result for SHA-256 b236e4b1ac9f5fa8…

MALICIOUS

PDF

103.8 KB Created: 2021-02-28 20:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0870792e0e08c5e5eba0ea4136f67790 SHA-1: 71a252ae5f201afd4aff4fca45489f627fe924c1 SHA-256: b236e4b1ac9f5fa8a191ee6bc6d84ca246650a4fb993a5e3abde3266ec340821
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 pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/wb?keyword=c6h6%20formula%20desarrollada PDF link annotation
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/abe2c28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5ff5e998bf826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_5ff1e96196e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5fd77476e76b1.pdfIn PDF document text
    • https://pulavirovedozas.weebly.com/uploads/1/3/2/6/132695401/98338.pdfIn PDF document text
    • http://899themes-demo.ru/agile_mind_homework_answer_key45zsi.pdfIn PDF document text
    • http://gtomishebs.xyz/how_to_deal_with_a_child_with_adhd_and_behavior_problemsgyh49.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/e7f3cfaf36.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_get_a_private_investigator_license_in_south_carolina.pdfIn PDF document text
    • http://pornbustyvids.com/davran_bilimleriy58mk.pdfIn PDF document text
    • http://mmamba.ru/pekogiwigofilewagegitoyh3tn.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/zodawanuror/roralinapoveviv.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/video_from_any_website_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/cooking_wine_osrs_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/73806921047.pdfIn PDF document text
    • http://tagafutufuj.rf.gd/buses_arquitectura_de_computadoras.pdfIn PDF document text
    • http://xapupatefi.rf.gd/maravilloso_desastre_2_google_drive.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 15516 bytes
SHA-256: ccfdaf5154777c0cb23bb4641fe723313095b82e39d227df4477afa339642deb
font_01_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 5208 bytes
SHA-256: 9091334ea14d6d9fb77c960252be7f9a6aa7561e1b70982e4651c66a8e5b44a0
font_02_sfnt_off000143d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D0 6300 bytes
SHA-256: f9040d1db0a4d2c36348b61deedb6452c7b89e1cf098c47e79d7154965611559
font_03_sfnt_off00015324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15324 12392 bytes
SHA-256: 2ebac865735ad674fdac068b52752bd67301edde30792c57508e71015f433088
font_04_sfnt_off00017be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE9 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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