Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dac43046e7d04a…

MALICIOUS

PDF

186.0 KB Created: 2021-04-05 00:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e120245cca79d713fb975ccd9f80a5f SHA-1: b0e1d0827170a3ff4d06301c09b2b5118899c279 SHA-256: 13dac43046e7d04a83e0d635758842e281a90819c52dc4d289ec9c7c36e5605c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The primary malicious URL, https://seumenha.ru/strik?utm_term=attack+on+titan+manga+vs+anime+season+3, is likely intended to redirect the user to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://seumenha.ru/strik?utm_term=attack+on+titan+manga+vs+anime+season+3 PDF link annotation
    • https://pexagujunivati.weebly.com/uploads/1/3/4/6/134684520/kibojoba-zunodugukalisif.pdfIn PDF document text
    • http://justamorem.com/53467376386gywrs.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/how_to_move_your_head_to_get_rid_of_vertigo8e8zg.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/c3ee3b3.pdfIn PDF document text
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/batufuwidilerajaf.pdfIn PDF document text
    • http://nosinoski.shop/wulusovanafibooy1fn.pdfIn PDF document text
    • http://shlifovka-pol.website/51411518630r1r0k.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/bosejagom-mojefubipokebew.pdfIn PDF document text
    • http://creampiepow.club/restricted_holidays_2018_tamilnadu88xk0.pdfIn PDF document text
    • http://universe1.space/xanukedetevagarebotzcrft.pdfIn PDF document text
    • https://watubozez.weebly.com/uploads/1/3/5/3/135346011/3074937.pdfIn PDF document text
    • https://pilogowizimofog.weebly.com/uploads/1/3/4/6/134604263/xixagekok.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/gesagovetaligamuduwu.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/858098bb-a51b-4cd6-8f3c-383ac3d48259/why_is_my_lg_dryer_not_drying_clothes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adabeaf0-e2c4-476f-8e59-59276147b1d9/why_is_my_little_green_machine_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b92edd-d822-4383-935d-f38fae4fed27/fufap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04159c72-46d4-41d7-9805-c06b8963bce7/romofumukufupijojeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4452914b-0cb9-4642-a1e3-084698ef166a/wupepufusedikupib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a17409-ee3b-40d7-9df9-dd38abd1eefd/bilonepusegopafaduse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d0642a-7671-4ada-afdd-a382968e3762/yaar_nuri_ztrk_kitaplar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53656ec8-2b47-4c25-ab8b-c0617aba7270/pexadazuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81b0656-50bc-49c1-ac29-f2815a57bac8/how_to_silence_apc_ups.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00026be5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26BE5 13280 bytes
SHA-256: eda9e677fb2d3b7c9efcb460893429046657c6f271a13e3e8bc16e4850fe7b4c
font_00_sfnt_off0001829c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1829C 70864 bytes
SHA-256: 75cd162c662df4f5f4129461989db589fcefaa933fdb47f48440aeea550ee09f
font_01_sfnt_off00025a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A03 5268 bytes
SHA-256: 759620d08097101ece986e580a6fb9a6f45975f5d01c79af57c5dc69cde4006f
font_03_sfnt_off00029173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29173 15376 bytes
SHA-256: f57ca3dc1e5b9ea7d44bfafa5a90003a6314684903d43e4ef19050c6f703b972
font_04_sfnt_off0002c1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1B5 16680 bytes
SHA-256: e67cba6180d11f2a05ae244d773f55452a3d85cf947880f3c6812707934bd992

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