Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec86f9e1def974c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 21:49:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b16f6e663dc6273af1d119ef166726 SHA-1: ee4266bc7db4b7a8355ba7ea8eaacc48087be03d SHA-256: eec86f9e1def974cd2a2dc2f144b218cdeadb83a26aeb25645913c56c418bbba
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to phishing or malware distribution sites, masquerading as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=algebra+vocabulary+worksheet+answers
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/5695497.pdf
    • https://cdn.sqhk.co/ninivaxibab/jb4RhjT/modern_simple_cv_template_word_free.pdf
    • https://cdn.sqhk.co/fedovipawe/hEo8zje/piano_tiles_4_magic_tiles_2019_apk.pdf
    • https://cdn.sqhk.co/sezelijimofi/icjdijF/adidas_ultra_boost_20_review.pdf
    • https://cdn.sqhk.co/ruzewekafan/fEY0iaJ/13329638150.pdf
    • https://cdn.sqhk.co/pifixijowoka/uigjbhe/telecharger_lucky_gold_have_a_lucky_day.pdf
    • https://cdn.sqhk.co/rapenikidu/eMhhggh/edit_2_pages_per_sheet.pdf
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/siwawanazudo.pdf
    • https://zusabave.weebly.com/uploads/1/3/1/4/131406295/jixivat.pdf
    • https://cdn.sqhk.co/zajagatetode/LkjjeQf/21588211087.pdf
    • https://cdn.sqhk.co/jorevagu/sUApjal/nogivu.pdf
    • https://cdn.sqhk.co/tinolaseja/ihFHhje/birds_flying_away_silhouette_tattoo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/083a05aa-5f66-41fe-a6d2-26be6abde148/beferudanuxix.pdf
    • http://wulemarodexik.rf.gd/alberta_ski_hill_snow_report.pdf
    • https://uploads.strikinglycdn.com/files/d64cc76d-d6fb-4bab-918c-7579e837db41/mavesawarebunugirukunawaw.pdf
    • https://uploads.strikinglycdn.com/files/87d2215e-c1d1-4fdc-8d69-504ba677b0d0/my_grandmothers_house_poem_explanation.pdf
    • http://vejidot.epizy.com/75787168432.pdf
    • http://vixoboguwexalo.rf.gd/latest_android_mobile_under_6000.pdf
    • https://uploads.strikinglycdn.com/files/ae85e0f4-4dfc-4670-ac5b-a63861595e7f/power_pressure_cooker_lid_replacement.pdf
    • http://fuvogixerad.epizy.com/icom_ic-706mk2g_modifications.pdf
    • https://uploads.strikinglycdn.com/files/8dc76004-9b96-49a2-9ecc-6ecd548d0cec/48730538576.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_off0000f579.bin
fec3fe31905cc0d1fa97790a15c99c4b7bc95e1770613bb4428b249f7170ce9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 5508 bytes
font_01_sfnt_off0001084f.bin
975c0179a39c96043f358b2ff1e15c75e17be8b66388de96ca5e387ee20cce9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 11524 bytes

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