Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a0c82d4cde1199…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 01:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a119be2931a1adb1ab1bda04c90400a SHA-1: dbddd4473b2c09c244cc3987f0623464acf7e652 SHA-256: f0a0c82d4cde11990b89bafb59479870eedef54e5804d1f868b6c3253c1093e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, suggests an attempt to redirect users to potentially harmful websites for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs that can serve as link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=catholic+archives+transcript+of+exorcism+of+emily+rose
    • http://kvrovk.xyz/ccsuweb_exam_form_last_date0yazx.pdf
    • https://cdn.sqhk.co/tefupudoma/uhiOhd2/68578358175.pdf
    • https://cdn.sqhk.co/mazinenik/gT1gflB/push_pop_stack_javascript.pdf
    • http://soldonlakewood.com/kavetijopobizegedyeqd.pdf
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fe9d0ed2369d.pdf
    • http://musofiron.ru/86083739449j7q0t.pdf
    • https://cdn.sqhk.co/gisatajofo/Zhcae1c/lalikowazojajifopiduwaz.pdf
    • http://casser.xyz/809869997364tfar.pdf
    • https://cdn-cms.f-static.net/uploads/4459914/normal_5fd8cc1d4d8a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_57411ca9a22b4a32b5975543c988697d.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c5568b03ef33424086b17805d1cf87ac.pdf?index=true
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_8da6d34788994ff6a8ccc0b9adfd579a.pdf?index=true
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_68eb4eb7c07444b2a28208f36c64386c.pdf?index=true
    • https://s3.amazonaws.com/loneminovu/rest_web_services_tutorial_java.pdf
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_b943efc5aa9c44eb8f1b45a09929721e.pdf?index=true
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_ca229bfcc5b64131bf59b6b1484b99e9.pdf?index=true
    • https://s3.amazonaws.com/gurupixabogivaz/43406862225.pdf
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_17e17fefb29b47fe9f06830a5eb74ab6.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed7.bin
87986a3de4141fd4aae8e259c6335fb082d147bf19851460f59505060a755d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 5296 bytes
font_01_sfnt_off000100bd.bin
7b8b4e109d0905d1888d162a91ff0b4b27b7d993f59fba6e96207b24f312bbba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10304 bytes
font_02_sfnt_off000123fd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.