Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab455584ef5bf0f…

MALICIOUS

PDF

103.9 KB Created: 2021-03-06 10:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad29b2cf7ee26f5cfffbb77f5743392 SHA-1: 209956d0829f5ab163215179b4821633bc3046a2 SHA-256: fab455584ef5bf0fc5d8433b2e75e92b149466baab5d1c0aab9b19a997d4107d
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the document's deceptive content point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=solutions+cloze+worksheet+answers
    • https://finowizefi.weebly.com/uploads/1/3/1/3/131383614/momed.pdf
    • http://pazefezos.mywebcommunity.org/iso_ts_16949_standard_free_download.pdf
    • http://movawizaxaxato.mywebcommunity.org/16420231729.pdf
    • https://nogorixarolixi.weebly.com/uploads/1/3/0/7/130740589/393f9aa0f7b9.pdf
    • http://rafupofamurawaf.mygamesonline.org/schwinn_ic3_console_commands.pdf
    • http://introdom.ru/android_xml_bitmap_sizeckt9a.pdf
    • http://woxijakuzadajew.getenjoyment.net/35905226029.pdf
    • http://silkhfig.bid/casio_g_shock_mrg_g1000_price_in_indiavoe3i.pdf
    • https://cdn.sqhk.co/zifeduwa/jbUMzWk/basketball_games_online_unblocked_at_school.pdf
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/josazimunuseg-xewaredez.pdf
    • http://zoluwofemofuper.sportsontheweb.net/2010_camaro_for_sale_jacksonville_fl.pdf
    • http://fovajifep.iblogger.org/89559529768.pdf
    • https://cdn.sqhk.co/luwibajik/VvChhhc/30160085167.pdf
    • http://ludshop.xyz/57645527022suy6x.pdf
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/443e3435f5615.pdf
    • http://bejawutipage.mywebcommunity.org/93398705175.pdf
    • https://dibozuvoba.weebly.com/uploads/1/3/4/6/134692955/d6179c954c.pdf
    • http://7gusevshop.website/vejebugufesofikukuri3t0xv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilepobafomunow.atwebpages.com/char_broil_infrared_grill_ribs_recipe.pdf
    • http://dovanokeji.epizy.com/segatitimoragemenital.pdf
    • http://kifugelewepin.epizy.com/compartment_exam_date_sheet_2019_class_12.pdf
    • http://xotaferuju.myartsonline.com/83394780232.pdf
    • http://rixuzomobe.epizy.com/geekbench_4_pro_apk_latest.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_off00015399.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15399 2828 bytes
font_01_sfnt_off00015d94.bin
c0604237c2e55f9eb6683b470e112cca85b0e23278c3ee008912e1f9e0104f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D94 5196 bytes
font_02_sfnt_off00016f55.bin
7c3758ef495ef6ee77ebe71281188190bd67342450715a941e2bceb92aad31fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F55 10188 bytes

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