Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0fcfcd9ace4598…

MALICIOUS

PDF

84.3 KB Created: 2021-03-25 01:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba469c0963a0bd8f5ae2b355ec19dbd5 SHA-1: e260e7b3efb20d60360a8c6943d8b8322621178e SHA-256: 7c0fcfcd9ace45981841868e63c39153e14febf329d345a99470a100ff0fe165
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=experiment+to+show+that+sunlight+is+necessary+for+photosynthesis+with+diagram
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/zoxujox-nelimiwa-gedurevuginem.pdf
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/128550.pdf
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/ba5d2283c00.pdf
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/b588e59d6a0b5b0.pdf
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/zofatirexidisex-morejomux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xafonabikox.rf.gd/what_is_the_difference_between_press_and_journalism.pdf
    • https://s3.amazonaws.com/penefelomiju/german_style_cv_template_in_english.pdf
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_6310b3b82466484d972924a3860858f5.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_5c270c7486f942fea008ddbe692b42db.pdf?index=true
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_7971dab6dfe247dc9f12ac6daea6dd73.pdf?index=true
    • http://foxesixa.epizy.com/how_to_do_well_in_an_interview_with_anxiety.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_541e6f9aeee544228e9b530e8b4851a5.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_dd267f334458491c9388881f9c911de7.pdf?index=true
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_56d9b506eb0e40ce8979d51d7c4600ba.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_7bd22e5fd72a4bfda17e01512c6b174e.pdf?index=true
    • http://relurifiluxel.epizy.com/14883095.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_3a79299c99a14659893acd79c20d11fe.pdf?index=true
    • http://bedigetulo.epizy.com/dukexewezadegofoguzuxur.pdf
    • http://revipopeguxasaf.epizy.com/lowuvilunogumuguroxutovi.pdf
    • https://s3.amazonaws.com/waxegatulo/android_studio_back_button_action_bar.pdf
    • http://dovuxomumebajip.epizy.com/jijofirefufutirajato.pdf
    • https://s3.amazonaws.com/lumixi/how_to_use_minn_kota_i_pilot_remote.pdf
    • http://gujimimokogofe.rf.gd/18281945774.pdf
    • https://s3.amazonaws.com/zamemigojat/jensen_vx7020a_manual.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/weather_report_kurrajong_nsw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc4.bin
7c2b1b37984369086bf95f4a8e3bb771a45231925ae5fe2aeb335b6064dc3e00
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 5668 bytes
font_01_sfnt_off000110fc.bin
b9d1f6e961b8c16144fa6678eece22f9ba831606635d3d216f39975b30661caa
pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 10556 bytes
font_02_sfnt_off000134e0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 4324 bytes