Malicious PDF — malware analysis report

Static analysis result for SHA-256 c496e7f3c1ec39dc…

MALICIOUS

PDF

80.9 KB Created: 2021-02-28 07:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831cd0bded2f786de2549bd87ecdd255 SHA-1: 3441c518cfbddabb55c022ef140b8a04bb84f77a SHA-256: c496e7f3c1ec39dce5c1fb9c683e053d92fba98fe9b75bebc7112f3ba3086497
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing or malware distribution sites, masquerading as academic resources.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=chemical+reactions+of+copper+lab+answers
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/3502470.pdf
    • http://kzrovk.xyz/brighthouse_financial_annuity_surrender_formes3ky.pdf
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/pijebuzapatak.pdf
    • https://lifinupal.weebly.com/uploads/1/3/5/3/135336288/wupevoxabuwigeg.pdf
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/kutivu.pdf
    • https://wekowegalovu.weebly.com/uploads/1/3/4/6/134668649/8490174.pdf
    • http://wiinorama.space/ruzagatepabarozikebef787w.pdf
    • http://lifolibi.sportsontheweb.net/how_do_i_change_the_battery_in_my_motorola_baby_monitor.pdf
    • http://mikazuxo.mypressonline.com/oracle_sql_date_functions_month.pdf
    • http://nizavevorupuj.mywebcommunity.org/79767177034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jadudusujuje/world_history_research_paper_topics_for_college_students.pdf
    • https://s3.amazonaws.com/gumegulaxi/kalvisolai_12th_answer_key_2019_maths.pdf
    • https://s3.amazonaws.com/salade/cardiac_science_g3_user_guide.pdf
    • http://pigutun.myartsonline.com/gadoduwovuvib.pdf
    • https://s3.amazonaws.com/jinabom/brooder_management.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_off0000f372.bin
8ced890c3f39ded18e87229eaf266a578b3faf15136581cb918cfe94deb831ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 5296 bytes
font_01_sfnt_off0001054c.bin
0c94d0fea7340bccce9a2c85794a905cc3b9f2cff30cf11c7e7909d32b5b4001
pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 10264 bytes
font_02_sfnt_off00012854.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 4324 bytes