Malicious PDF — malware analysis report

Static analysis result for SHA-256 a132c2c12c2bdc53…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 07:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 941857f0941e74bed45908a622fb50dc SHA-1: b8a340e39e0541e1dc614b814c803fa451747767 SHA-256: a132c2c12c2bdc53ef41616eb58906143b7548e983551971f9b76d23190bc86d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The document's content and structure align with a lure to generate traffic and potentially exploit users through the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://midufefew.ru/award?keyword=augmented+matrix+pdf PDF link annotation
    • http://autokenn.com/go_math_grade_5_workbook_online1o43t.pdfIn PDF document text
    • https://ridewavovelomu.weebly.com/uploads/1/3/4/6/134697160/fowom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_6001d37a9d5ad.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/hbeOf0f/dining_table_set_for_4_with_chairs.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/hehjjhv/tolubewusidejoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_6028f46b36797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_6001e9db38c17.pdfIn PDF document text
    • https://cdn.sqhk.co/poraloguve/xcVjel5/31810215116.pdfIn PDF document text
    • http://sosed.market/31546096971we4sn.pdfIn PDF document text
    • http://my-favshopd.online/16054876388e77y9.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/iaib8hj/72195329106.pdfIn PDF document text
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/d2d38bc6d30fb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_6066695002bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_60418e1f278ec.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/hexijhh/sdgs_17_tujuan.pdfIn PDF document text
    • http://junemam.22web.org/ankhiyon_ke_jharokhon_se_song_lyrics.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/248a11c543.pdfIn PDF document text
    • http://xojitufos.66ghz.com/does_wine_make_you_gain_belly_fat.pdfIn PDF document text
    • https://loligilifalo.weebly.com/uploads/1/3/0/7/130775627/f4233082.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/bezak_xebusuv_sitolikirud_zuvagewedaporo.pdfIn PDF document text
    • http://megahit.space/how_to_train_for_pull_upoangl.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
    • http://nudenagazosizav.epizy.com/99787630484.pdfIn 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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 4980 bytes
SHA-256: cb8e764f85dd960003188b059f16ee2f839ce79df0a077b51f2640a36286eff1
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 11040 bytes
SHA-256: 9cb7a1277dcc31980f37775be5ced613bcfdb39ea738a82402ab508061314491
font_02_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f