Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b0555dc440faec…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 16:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebebfad5bb068feb51b51229b5fa8111 SHA-1: b2f83e2db02c4fd1ae851b3f655096de25c76fce SHA-256: 62b0555dc440faec9095236c1eda616f415556cb2c285eff3906f9fa92100d19
186 Risk Score

Malware Insights

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

This PDF file, identified as malicious by ClamAV and an ML classifier, functions as a link farm. It contains numerous external links, including one to 'soxebez.ru', suggesting an attempt to drive traffic or distribute malicious content. The PDF's structure and the presence of embedded links indicate a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=nervous+system+questions+and+answers+pdf
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/gavofuba-fusoguxizawesu-ribexalupowisa.pdf
    • https://cdn-cms.f-static.net/uploads/4495409/normal_603d368aca8d5.pdf
    • http://lizoguxumugef.mywebcommunity.org/94637242594.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_606431413ff29.pdf
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/7b2acc6b260b.pdf
    • http://pogolaf.iblogger.org/luigis_mansion_2_sheet_music.pdf
    • http://muxoman.mygamesonline.org/9346817645.pdf
    • http://zevupixikug.mywebcommunity.org/role_of_biotechnology_in_food_industry.pdf
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/def77c5510749.pdf
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/6820701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_9c6db480bda04940998d3b7085882c8c.pdf?index=true
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_b13d523acd744355a84c92e8a6f0cdef.pdf?index=true
    • http://wojibikifi.myartsonline.com/materiales_dentales_unam.pdf
    • https://uploads.strikinglycdn.com/files/c19bff1a-a5ca-441c-9164-727ebc1ad58c/english_grammar_practice_test.pdf
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_3dd89dad9a4146ceb5bb009fae06f4ec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6db76c48-c016-4dd6-82ec-437b3a40f986/texas_instruments_nspire_cx_cas_graphing_calculator_online.pdf
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_a5e1059e8b95428089919a7a7ffd1c99.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e834da52-3df8-41b7-b6cf-c8c90697982e/premiere_pro_keyboard_shortcuts_not_working.pdf
    • https://uploads.strikinglycdn.com/files/8c323058-0bd5-4ffa-89dc-4836848ae691/police_psych_test_example_questions.pdf
    • http://bixuxopot.epizy.com/how_to_apply_for_maternity_benefits_in_japan.pdf
    • https://uploads.strikinglycdn.com/files/cfad3c7d-b1ca-4357-89f0-cfaf082654e1/bandura_social_learning_theory_quizlet.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_off0000ef98.bin
144c2de5a2d5d09e1a48342b0b9467a91beb3703a3e97b9c9d26c8576689e7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5504 bytes
font_01_sfnt_off0001025a.bin
66aa55794ca18dd2d49af8ab13081f33af0e2cfe494ac435a4a557d77b1c72bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 11452 bytes

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