Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b418d2a01ff702…

MALICIOUS

PDF

103.7 KB Created: 2021-05-30 03:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f33f98b019e70f191e6ddb2922cac2c4 SHA-1: 80a50ae912d068f077265b96da9d7a8dfae126e7 SHA-256: b1b418d2a01ff702aad6d72f8877c58c2d41b672fafb2843160924c29c4e1aaa
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many of which are hosted on disposable domains. The presence of a 'download button' heuristic suggests a phishing or social engineering lure. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=tebesa+amharic+book+pdf+free+download PDF link annotation
    • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/a99e972544e8691.pdfIn PDF document text
    • https://waleberof.weebly.com/uploads/1/3/4/3/134385841/6574994.pdfIn PDF document text
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/7896919.pdfIn PDF document text
    • https://xetomulezaze.weebly.com/uploads/1/3/0/9/130969551/4043409.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/sejaxa_piselumutimaso_nafegizixafexi_koxegelutazoji.pdfIn PDF document text
    • https://guxodovuze.weebly.com/uploads/1/3/4/3/134333652/7286146.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/zavejojijez-rakabekigixem.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/766a17d8dce9.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/tujexomo-pumuwimawu-pimutavifejogi-lamodanexamuluj.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/zadijokemafapiroliro.pdfIn PDF document text
    • https://tixosame.weebly.com/uploads/1/3/4/5/134523113/selipojavebebep.pdfIn PDF document text
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/wimutesejuj.pdfIn PDF document text
    • https://gezumadugoviful.weebly.com/uploads/1/3/4/6/134611133/dakenupa_dununoporizexe_xunimozalotone.pdfIn PDF document text
    • https://nikitepiwaligu.weebly.com/uploads/1/3/4/6/134647260/ea8aab283b.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/vujizirudubul.pdfIn 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/ca9b4f09-7bc9-41b7-a8e9-5b0ba07061bc/bonusipomovaxideti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d8c9e4-daac-4b52-8d54-53c04b67a088/38182723629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa58fe9-19e6-4b29-ba85-fdda5b73a51d/4577947023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355478f8-c02d-4387-978e-59e08c3b5196/troy_bilt_storm_2410_electric_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51697308-67c2-4b08-88da-e72a8d02ba1c/797876275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb54966a-d08f-4787-9dc8-418132ab562e/68549008702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22be711c-aa8d-4322-a309-37bf83da6b1a/jufiwavovejijazugiko.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 26976 bytes
SHA-256: 4c39b01f072de64dfbaad1c9f5359b9a4c5a59aeba6bcca04ca79529794ca9cd
font_01_sfnt_off00014f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 5640 bytes
SHA-256: 261eac4cd279fe3cd0f9e4757786153505e8bdfc77be2e2e0aad89aba72cb0e6
font_02_sfnt_off00016222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16222 14220 bytes
SHA-256: 30d1b7805e3dcff6d909997376346179b01c9d7a8a2f8dc0f3d9cc19cf92e9e2

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