Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedd4495045f22d9…

MALICIOUS

PDF

84.1 KB Created: 2021-03-20 20:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e767bdb5a7fd29600723fcdf8cdcbfe SHA-1: 78aea7534dafd328eea9fb22b8f57ea453c2b076 SHA-256: aedd4495045f22d96898051ec9fd1ba1ce476eff56612526e96be0ba7e903aaa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links designed to mimic search results. The embedded URLs point to domains commonly associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/award?keyword=fsc+biology+book+1+chapter+11+pdf
    • http://nifazafagikoxa.medianewsonline.com/52110014765.pdf
    • https://cdn.sqhk.co/goduwonon/3idVrjh/85278511667.pdf
    • https://cdn.sqhk.co/mexovaru/jasjeie/pubg_mobile_lite_facebook_login_problem.pdf
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/2948747.pdf
    • https://cdn.sqhk.co/sazipuvaxiv/ejjUhhJ/lopudit.pdf
    • http://wetikufuwigiwox.iblogger.org/vc_redist._x64._exe_64-_bit.pdf
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/juxomidek.pdf
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/pegexiwinigajub.pdf
    • https://cdn.sqhk.co/lusesito/hcGwifG/mineral_spirits_lowes.pdf
    • https://cdn.sqhk.co/pavupaken/iOLWIwt/super_bowser_logan_vs_jeffy_run_adventures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_dbeedfa0b5e84a97acde77ebda71c9f9.pdf?index=true
    • https://s3.amazonaws.com/purufiz/65703163466.pdf
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_8c040f19f3b441d29c82e5ee362e179b.pdf?index=true
    • https://s3.amazonaws.com/dudurat/pisilibekuwigulirifajizi.pdf
    • https://s3.amazonaws.com/mijumomub/59681164829.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_6d6af736aaa645f6a98470aa249d5f62.pdf?index=true
    • http://supuwevul.atwebpages.com/xiwukipolaposeke.pdf
    • http://lumosaneja.onlinewebshop.net/novela_amantes_del_desierto_capitulo_12.pdf
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_884ceb7cee0a42169417e68e0a052432.pdf?index=true
    • https://s3.amazonaws.com/vexosafugunu/paxugalupuluratejesunu.pdf
    • https://s3.amazonaws.com/najubu/can_rafael_speak_spanish.pdf
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_1d7ba7b9d1284417bdc3c3be9bb264c4.pdf?index=true
    • http://buvumurasamaku.rf.gd/netafilufuteluxavatizuf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a72.bin
15c4c89ddfd69ed74d88864c5ac3be9d0eacf1f2128171775302bb16783396ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 5732 bytes
font_01_sfnt_off00011dfa.bin
44e84e786ede71975297ad5ca795e43a179ef6bcd9d44b5b6af56d04b12ef50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 10900 bytes

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