Malicious PDF — malware analysis report

Static analysis result for SHA-256 a221ecc88dbdcaf3…

MALICIOUS

PDF

93.2 KB Created: 2021-03-20 06:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 502338793ac108289c19c1cfb23f5a5d SHA-1: 949caa2134cd663d5eaf1bca80fb48fad0a7513d SHA-256: a221ecc88dbdcaf31b795be5d9c89573855d1fa9c46e0b1d09d526de86085f72
194 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains keywords related to business plans, likely serving as a pretext to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=post+construction+cleaning+business+plan PDF link annotation
    • https://cdn.sqhk.co/nivavepe/ja1Fk2F/wd_my_cloud_home_duo_16tb_test.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/Kghowhg/iphone_music_player_for_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/jahg7ih/78842244121.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/hcchgl7/37641563852.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/ahdujfw/super_hero_tycoon_script_gui_2020.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/9740949026.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/libros_apocrifos_enoc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_d57c41b615bc42b09b0baea857c9836f.pdf?index=trueIn PDF document text
    • http://newemepakirid.myartsonline.com/b_v_ramana_engineering_mathematics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67284ab-f866-4da7-a33d-217e4f976050/kirkland_spiral_sliced_hickory_smoked_ham_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/junelalariboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824a36b1-1f13-40f4-bedb-a18688e3795a/82519187366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4613307b-2296-4ae6-af01-0b7b884634a9/aws_interview_questions_for_oracle_dba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7e7271-514a-47cc-91aa-bd92b99bc0f5/mechanical_engineering_internships_chicago_summer_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/lewowebokusule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63202ad2-7f5c-4923-b527-9604731d5bac/sezovosogupozimugejemov.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/99077066816.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/vopij.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/ranenawoponomipufuju.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/best_annotator_android_app.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_4e5136e1d98e4ba384ba583071b449ed.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_57c14dc2dd9d47528adfa4ca8f84035c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 5124 bytes
SHA-256: fa739af1d17f8c0770980c717ac95f7dbae21b3b1d45a22796a8b352cd605831
font_01_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 11044 bytes
SHA-256: a339ead1d26c02c15f437bdaf1f24594a7d01e65852d67e1194cf70b9b8641f8
font_02_sfnt_off000158e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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