Malicious PDF — malware analysis report

Static analysis result for SHA-256 799c1b525bf3e0f4…

MALICIOUS

PDF

81.0 KB Created: 2021-04-28 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 96a6cdba42f1e5b0acf4ca5e29c365aa SHA-1: cfb01bce1c7c23f03e92b09a2314dac62a967200 SHA-256: 799c1b525bf3e0f4a55049af17c9d8250d19db92274beaccb1f838240c14010b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://botokaw.ru/strik?utm_term=what+is+the+minimum+investment+for+penny+stocks PDF link annotation
    • http://gisowutuxa.22web.org/spoken_english_online_classes_in_bangalore.pdfIn PDF document text
    • http://tatokovobuvimi.iblogger.org/aircraft_engineering_textbook.pdfIn PDF document text
    • http://new-volosi.ru/zamaky1g2v.pdfIn PDF document text
    • http://oneshops.space/denda_tilang_sim_c_2019xshg2.pdfIn PDF document text
    • http://dudakarebonadi.iblogger.org/newomunipasixekoneku.pdfIn PDF document text
    • http://zipoger.22web.org/richard_bandler_books.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/fakomufulukikoxujixozaaug2k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeliganav.epizy.com/what_reading_level_is_harry_potter_a-z.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_c5a7b27582d54dd181288ed02c18346c.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_8789f7e2c39e4ed7a129ef1d36fb79d0.pdf?index=trueIn PDF document text
    • http://talaxevavilur.rf.gd/dragon_quest_9_armour_guide.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_601518c5d5044aac9a9896c16026eba3.pdf?index=trueIn PDF document text
    • http://babokad.epizy.com/unity_5._6_video_player_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/buvote.pdfIn PDF document text
    • http://taxatix.epizy.com/advanced_engineering_mathematics_solutions_zill.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_5219a4e8923a406ab34c166e6892f699.pdf?index=trueIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_6a375fb793074e69aa213d4d6f4a83ef.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_63d388c803734a22adcfdea8cc01e0d5.pdf?index=trueIn PDF document text
    • http://nuwumunis.epizy.com/bittorrent_android_location.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_6860db259bd34f0991039340c2a1088b.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_f467ea7cf1984b63b12352811dc48b18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/justification_report_converter_utility.pdfIn PDF document text
    • http://ginokaze.epizy.com/southern_literacy_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/absceso_axilar.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 5460 bytes
SHA-256: a43dd91d92ddc23f1f3d76213dcca4fc58743b7749b2067710c384dbbe2dd113
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 10956 bytes
SHA-256: c5aecff35f0a466e78ebc1637cf235648667810818a59f9ffcebb9eae55f9436