Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35c87cd9bedc991…

MALICIOUS

PDF

122.5 KB Created: 2021-02-15 11:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b9d9ee494de86619f0580456924cc44 SHA-1: 5c9662bf557086e6e2a09f7a17e06572bc9c1876 SHA-256: a35c87cd9bedc991ecd27b44536cf7d2b69cfcbb266b738ab3ed0502ee2260e6
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=cualitativa+y+cuantitativa+quimica
    • https://cdn.sqhk.co/riketumes/GRjfifu/ww2_battle_games_online.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_60135adee9f0d.pdf
    • https://kexujutexaz.weebly.com/uploads/1/3/1/8/131858540/gukaxekibogot.pdf
    • https://cdn.sqhk.co/relulapezele/7XhadhM/vanilla_cupcake_recipe_from_scratch_easy.pdf
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ff2d2323ddb9.pdf
    • http://papuleni.22web.org/insider_reporting_osc.pdf
    • http://ketosimple.online/what_are_the_4_main_components_of_a_mental_status_examcaawo.pdf
    • https://cdn.sqhk.co/konidadelan/hcjcslV/39225559084.pdf
    • https://cdn-cms.f-static.net/uploads/4450864/normal_5fd218380e08e.pdf
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/gubizesidux.pdf
    • http://gouliwer.online/galactocele_por_ultrasonidogfk81.pdf
    • https://cdn.sqhk.co/kuzaxepigi/bPic2Um/tofonubilirinud.pdf
    • https://cdn.sqhk.co/minamojazi/anhiz2M/huey_s_beyond_burger_calories.pdf
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/koriridajafese.pdf
    • http://vixidijogaritix.22web.org/critical_theory_dictionary.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/saviwobo-zonapefidoxoj-zanibexovuve.pdf
    • http://esclick.pro/74593917620ad86z.pdf
    • http://websecurer.tech/zikurftipj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lusiromipu.epizy.com/car_accident_news_report_today_toronto.pdf
    • http://zebigibozudival.epizy.com/excel_template_to_keep_track_of_passwords.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001868a.bin
eedae20648927f293140ffa82ac82186489616f9d5821a883a3664fbeb1c9182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1868A 4864 bytes
font_01_sfnt_off00019717.bin
1c4df13dd1a8b0f2a80e103796f55d52d44d7937f455a129041ac5c3c1a714f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19717 13384 bytes
font_02_sfnt_off0001c270.bin
c1ce675d4e6b981424d79d70dacba0cf02314c91c8e286fe87f1e5c976596670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C270 16784 bytes

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